Optimizing Vuze (formerly Azureus) for Speed


optimize-vuze-for-speed-Vuze-frog-icon-imageThis guide shows how to speed up downloads in the freeware bittorrent client,  Vuze.  All bittorrent programs need to have their incoming and outgoing communications flow freely in order to achieve the highest download speeds and that is essentially what this guide is about.

There are a series of guides for using torrents here at Gizmo's Freeware.  Vuze is one of the suggested bittorrent clients at Best Free Bittorrent Client.

See also How To Use Torrents for links to the other guides, and other helful software reviews, here at Gizmo's Freeware.

I assume that you already have the installer from the download link in the Best Free Bittorrent Client Review.  

If you do not have Vuze, you can get it from the

This guide was put together using information given by the developers of bittorrent programs at their forums, guides and FAQs.  There are no secret tricks, just the real basics of proper set up of a bittorrent program.  Following these simple steps should result in increased download speed.

These are the basic principles of optimizing a bittorrent client, like Vuze, for speed: 

  • Choose a proper port to avoid ISP blocks and conflicts with other programs
  • Forward that port through any software firewall and router to allow incoming connections
  • Adjust internal settings based upon upload capacity of the internet connection to allow room for outgoing communications and to distribute upload efficiently. 

There are some programs that claim to optimize speed in Vuze.  Such programs are a scam and generally contain adware or spyware.  I have seen it said, by the developers of all bittorrent programs, that nothing will increase your download speed in a bittorrent client more than the basic steps set forth herein.

If you are not using Vuze,  there are several other specific guides for other clients and a general guide here:
Optimizing Bittorrent Clients

Before starting the guide, in Vuze go to Tools>Options>Mode (Azureus>Preferences>Mode in Mac) and set to Advanced.


Choosing A Proper Port

To avoid messing up a network connection that is already cleared, first check and see if your communications are blocked or are already clear. 

Testing The Port

Vuze has a built in port test located at Help>NAT/Firewall test.  Before using this test disable and blocklist as the Vuze server is on some blocklists.

The test will show the TCP and UDP (they should be the same, but do not have to be) port already chosen for Vuze. You do not have to change to the port show in the images here.  You should test both the TCP and UDP, by pressing the Test button.  This image has the TCP result - you want to see OK.


This is the result that you want to see for UDP


 OK (Success)-just go to Adjusting Internal Settings.   Error- follow all steps.

If you failed the port test above, then you should first set your port to a proper one.  The most important choice here is to avoid using a port within the 6881-6999 range. This was the range originally used by bittorrent programs and is often blocked by Internet Service Providers (ISPs). (If your port was in this range, change and re-test).

The safest choice is a port in the 49160-65534 range as this will avoid ISP blocks and possible conflicts with other applications.  This range used to be 49152-65534, but apparently Vista and Windows 7 grabs some of those ports in between.   Vuze-Wiki: Port is Blacklisted

Windows users, if you want to make certain there is no conflict.  Go to the command prompt and type in netstat -a >c:\log.txt  This will check to see which ports are being used and save a log text file at C:\.  Looking at the text file, you will know which ports to avoid.

In Vuze go to Tools>Options>Connection.  Depending on your Mode setting, you may only see one number



Forwarding The Port

A router will block incoming communications unless an exception is made.  All software firewalls will block incoming communications and most will also block outgoing communications, unless an exception is made.  If you are "firewalled", then other people will not be able to initiate connections with you (see Why Is Being Firewalled Bad).
As there are many firewalls and routers, this guide can not give explanations as to each.  However, there are guides available, on the internet for most firewalls and routers and this guide will link you to them.

Software Firewall - The permission should be set to allow TCP and UDP in both directions.  Generally, you will have a choice to set permission for  the Vuze port or for the Vuze program.  Setting permission for the port is the very slightly safer choice.

If you are forwarding the port only, then you should also forward port 49001 UDP (the mainline DHT port) in addition to the main port above. You can check these options for guides:

Router - There are two choices here.  The easier way is to use UPnP.  However, this has a possible security issue.  Using UPnP allows any program to create a port mapping through the router without consent of the owner.  Note:  Given the recent findings of Rapid7 regarding security flaws in UPnP, it is generally suggested here that manual forwarding be used.  If you still want to use UPnP, then it would be a good idea to test and see if your device is vulnerable to attack through UPnP.

The other choice is to manually forward the port through the router.  This does not have that security issue, but involves going through several steps to accomplish.  Using the guides linked herein, this should not be that difficult and is the preferred method.

You should set a rule for the port number chosen above and then you should set a separate rule for Port 49001 UDP as this is the port that the mainline DHT uses. 

UPnP (NAT-PMP in Apple) - The Easy Way Enable UPnP (NAT-PMP for Apple) in Vuze and router.
Automatically refresh mappings when NAT status is "firewalled"  should also be enabled.



Manual Forwarding

  1. UPnP (NAT-PMP) must be disabled in Vuze (see Images above). 
  2. Use the Static IP Guide.
  3. Set permission for Vuze port you have chosen, This should be set to allow both TCP and UDP communications.. Port 49001 should also be forwarded, but  for UDP only.
    You can check these options for guides: 

Click Here to Re-Test Port    Success-Proceed to next step.   Error- re-do steps or seek help in Forums.

Adjusting Internal Settings

The  most important setting here is to cap upload in Vuze to 80% of your overall upload capacity.   Setting upload in Vuze is a fine line.  The more upload you give, the more download you will get from other peers. However, if upload is set too high, or to unlimited, then download speeds will suffer as outgoing communications (acknowledgment signals, resend requests etc) will be interfered with. Other adjustments are made here to distribute your upload so that you receive back the most download from other peers.
This section of the guide is based on the Vuze-Wiki: Good Settings page.

You should be in Mode = Advanced.as stated at the begining of this guide.

Speed Test: Speedtest.net (Click for Test)
First the upload capacity of your internet connection must be determined by taking an online speed test.  Speedtest.net has test locations worldwide and will highlight the one closest to you.
To take the test you must have Flash installed and javascript enabled.

Before taking the speed test, press Settings in the upper right of the speedtest.net page.  This will take you to another page.  At the bottom of that page is the "Global Settings" options.  Set "Speed Measurement" to kilobytes and press "Save" .  This will facilitate entry into the calculator below and will lessen confusion as qBittorrent shows speeds in kilobytes.





You should stop all internet activity, including torrents, before taking the test and the test should be taken a few times to obtain a reliable average. Results will now show in KiloBytes. It is the upload rate that is important here.


Another Way To Test Upload Speed
For most people these test results will be reliable (Comcast users see Note).  However, you may wish to do a double check on real life upload speed.  When you are seeding a torrent with a good number of peers and you are using your upload cap, set upload to unlimited and watch for about 5-10 minutes and see where upload settles in at.  Then input that number into the calculator in the kiloBytes section. 

Note:  Some ISPs will show inaccurate results on the speed test.  If your ISP has anything like Comcast's PowerBoost, then your results will show higher than the actual speed of your connection.  PowerBoost provides a burst of download and upload speeds above your provisioned download and upload speeds for the first 10MB and 5MB respectively.  Since the speed test involves relatively small files, this will skew results upward. 
If you have PowerBoost, or something similar, my findings from my own results and those of others is that the actual speeds are 60% of the test result.  So if you get 200kB/s for upload at the test, you should enter 120 in the kB/s box in the calculator.  Using Google ("speed result" x .6) will get the proper number to enter in  the calculator and this actually turns out to be very accurate.  You should end up with the calculator showing a cap that is about half of the test result.

Calculator Azureus Upload Settings Calculator
Once you have an average upload speed for your connection go to the online Azureus Upload Settings Calculator. Although designed for Azureus, this calculator will work for all bittorrent clients.
This calculator was created by the8472 a contributor to Vuze (fka Azureus) and part of the team that created Bittorrent Protocol Encryption.

Enter your average upload speed in the appropriate box


The calculator will automatically give the proper figures to adjust various options in µTorrent.


Input Results Into Vuze - Screen shots of locations in Vuze of settings to be adjusted

Tools>Options>Transfer            Azurues>Preferences>Transfer


Do not enable the "Auto" setting


Tools>Optoins>Queue                Azureus>Preferences>Queue


Peer Sources & Encryption

Having the proper peer sources enabled, such as Peer Exchange (PEX) and Distributed Hash Table (DHT), will help download speeds as they will help you find additional seeds and peers for a torrent. 
Encryption was primarily designed to thwart Internet Service Providers interference with bittorrent.  Having encryption enabled and allowing incoming legacy (non-encrypted) connections will provide you with the largest pool of seeds/peers to select from.

The settings for peer sources are at Tools>Options>Connection and should be set as in the below image:


The settings for encryption are at Tools>Options>Connection>Transport Encryption.  The settings shown in the image below will provide the highest encryption level and still allow connection with the most seeds/peers:


Mainline DHT Plugin

I now suggest the use of the Mailine DHT plugin in setting your Vuze up to get the best possible speed.  The DHT enabled in the step above is the Vuze implementation of DHT and is used by a minority of users.  The vast majority of users utilize the DHT implemented by µTorrent.  Installing this plugin will allow you to connect to both the Vuze DHT network and the µTorrent (or Mainline) DHT network.  This most likely will not make a difference on very healthy torrents, but on smaller torrent swarms may be a great help.

Since this guide is getting long enough, I decided to put the instructions for installation of this plugin on a separate page.  Please go to Vuze Help:  Installing The Mainline DHT Plugin for instructions.  It is a very simple installation process.

Good Torrents

The general rule here is to choose torrents that have a high seed to peer ratio. Seeds have 100% of the content associated with the torrent and are only uploading to peers. Peers also upload to other peers, but are also looking for other peers to upload to themselves and their download capacity is almost always higher than their upload capacity.

This applies even though one swarm has significantly more active users than another. For example, a torrent with 30 seeders and 70 peers (30% seeders) will generally be faster than one with 500 seeders and 2500 peers (20% seeders) as the average upload capacity available to the peers will be higher. (TorrentFreak).

For more information see Good Torrents

Related Articles

Gizmo's Best Ever Freeware Forums

If you still have issues after using this guide and would like some assistance, you may post here or our Forums.  The comments section here is not well set up for ongoing discussions, so the forums are a better place.

When posting on a speed issue, please provide

  • Your speed test result for both upload and download speed in kiloBytes per second (kBps)
  • Your result at canyouseeme, both before taking any steps and after.  Just indicate Success or Error do not post your IP address.

If you have a suggestion or correction for the guide, please post here.

Those who wish to post a thanks may post here or in the forums. I always appreciate hearing from those who this helped and I do read the posts regularly. I used to respond to each thanks, but realized it was clogging up the comments section. I thank all those who have posted their appreciation and all those who will.

So, to those who post a "Thanks", I appreciate it.



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by mr6n8 on 17. January 2010 - 17:15  (41322)

I found nothing to indicate NTT is interfering with bittorrent.

I am glad to see higher speed on that torrent, but with those test results I would have expected even higher.

Just to make sure, did you change the settings at speedtest.net to show kiloBytes?

If the result is in kiloBytes, then the 2782kB/s is fine. All I can say is the next time you are on a torrent that is using up to your cap on upload, set upload to unlimited for 5-10 minutes and see where it caps out. You can then take 80% of that and, if still downloading, watch your down speed and make some adjustments up and down to see where the best speed is.

However, with your upload rate, a torrent that uses your upload cap may be hard to find. Most people have much slower connections.

On that test torrent upload rate does not matter much as you are not going to be giving out much upload when downloading.

For now, just give the current situation a go and see how speeds are.


by Anonymous on 18. January 2010 - 11:44  (41429)

Hey Steve,

Yep, i had set the speeedtest.net to kiloBytes before testing. No one can miss it from the excellent tutorial u have given ;)

I haven't found anyone reaching my upload cap. So guess all I can do now is just observe for few days and use some trial and error method. :)

Thanks a lot for all the help you giving Steve :)


by mr6n8 on 18. January 2010 - 14:00  (41440)

Glad to help Rash.


by Anonymous on 16. January 2010 - 23:26  (41255)

I have trouble understanding some of this so I feel stupid asking this question. I've used Vuze for awhile and have followed all of the instructions for good settings, etc. but I just don't understanding share ratio. The share ratio on some of the torrents I've downloaded are really low. They range from 0.024 to 5.080. Can I change anything per torrent? All the information I find that's related to share ratio concerns faster downloads, but that's not what I'm asking about. I want to share fairly.

by mr6n8 on 17. January 2010 - 0:49  (41261)

There probably is not much you can do about that, but there is a couple of changes that might help.

First of all share ratio is the amount uploaded divided by the amount downloaded. So if the download was 500MB and you upload 250MB, then the ratio would be .50

The 5.080 would mean you have uploaded over 5 times as much as you downloaded on that torrent.

It is hard to say why some are low, as it could be due to the fact that there are a lot of seeds to peers or there are not any, or many, peers. I am assuming you leave these all active after the download is done.

You could try adjusting a setting at Tools>Options>Queue (expand)>Seeding (expand)>First Priority. Try setting the First Priority setting for "A share ratio under" to 1:1. This will give seeding priority to a torrent with a ratio less than 1 over one that has a ratio over 1.

Really though your overall ratio is more important. You can look at Tools>Statistics on the "Transfers" tab. This will show your current transfer rates under "Now", the totals downloaded and uploaded since you last opened Vuze (under "This Session") and the amount uploaded and downloaded since you installed Vuze under "Total".

If "Total" is showing a ratio over 1.0, then you are doing fine. How long you want to keep some active when there is no activity is up to you. It really depends on how many seeds/peers there are on the torrent.

If you have any Qs, let me know.


by Anonymous on 4. January 2010 - 0:22  (40174)

i'am not looking for a new client i have new vuze version
i just whant to have good download and upload seem bfore
what should i do? i will be obliged if u hellp my
and i have qustion how i incris the download

by mr6n8 on 4. January 2010 - 14:46  (40235)

All I can tell you is to follow the guide. It is the basic steps to setting up Vuze for best speed and is based upon the Azureus-Wiki Setup and Optimization, NAT Problem and Good Settings pages (but I think it is easier to follow).

If you have issues anywhere along the way, let me know and I will help-hopefully successfully.


by Anonymous on 3. January 2010 - 12:03  (40122)

hi steve i really thank u to hellp my
i'am soory couz i did not give u the fuall information
i just change the speed for upload and the download speed
i Follow Adjusting Internal Settings but it's worse than bfore
i get 28kb upload and 30kb for download
now i delete vuze so now what the first stupe
bfore i'am using vuze and it's ok but the new version

thank u


by mr6n8 on 3. January 2010 - 13:24  (40130)

I am not sure where you are at now.

Have you installed an older version of Vuze or are you looking for a new client?

If you installed an older version of Vuze, all I can tell you is to try the guide again.

If you are looking for a new client see Best Free Bittorrent Client

Let me know where you need help


by Anonymous on 2. January 2010 - 10:12  (40019)

i'am using vuze but now i change the settings

all download stop and also the i cant search
so if i rest the settings this will fix the problem????

by mr6n8 on 2. January 2010 - 12:33  (40032)

Hard to say as I do not know what settings you changed. Although I can not figure out what would cause the symptoms you have.

If you want to set Vuze to its default settings, you need to delete azureus.config and azurues.config.bak from the application data folder (called Azureus).

Go to Tools>Options>Files and there will be a link to the AppData directory at the bottom of the screen; or
Click on Start>Run, and type: %appdata%\Azureus

If that does not correct your issues, let me know.


by Anonymous on 2. January 2010 - 0:15  (40000)

Does anyone know how to make green smileys appear for your torrents? I've tried almost everything to try and fix the NAT problem with Vuze and I am desperate for an answer. I did almost everything listed in this guide: I gave my computer its own Static IP, made an exception in McAfee Firewall (Windows Firewall is disabled, btw), gave Vuze its own port, forwarded that port on my Linksys WRT54G router, and yet I still have yellow smiley faces on my torrents and fail every time I take a port check test for Vuze's port. If someone could please help me with this problem I would be much obliged.

by mr6n8 on 2. January 2010 - 3:41  (40008)

There are several possibilities.

What port number are you using?

What security software, other than the McAfee Firewall, are you using?

Do you have any other hardware (modem. switch etc) , between your computer and the internet other than the router?

Have you tried disabling the McAfee firewall while taking the port test?


by Anonymous on 2. January 2010 - 4:31  (40009)


-I'm using the port 56465 for Vuze.

-Not that I know of. I only have McAfee installed on my computer. I've given Vuze full access for incoming/outgoing connection under 'Program Permissions' on the firewall and still nothing. I even went under 'System Services' and opened the port up for Vuze, but it had no effect.

-Not that I know of, but if there were one, would I have to forward the ports to that hardware first?

-I haven't tried disabled McAfee, but as to not risk a potential security threat to my system I won't do that. Is there some alternative to this?

More specs about my problem:

-I've disabled UPnP on Vuze but not my router. Could that play a part in this problem? Should I disable UPnP on my router as well?

-I've set up my router to use the DHCP server to assign IP addresses to all my computers in my network except for the one I'm using to type this message and for my PlayStation 3, which I have assigned a static IP to both. Could this also be a cause for this problem of mine? Would I have to assign a static IP to every device on my network?

by mr6n8 on 2. January 2010 - 12:41  (40034)

The port number is good.

Do you have McAfee security suite, which includes an anti-virus?

You probably do not have the hardware as you would be seeing it. Many people have a modem for internet access. Most modems do not have firewall capabilities, but some do.

I only meant to disable for the port test. There would not be any security issue as long as you are only testing at canyouseeme. This was to see if the issue was there (especially if you have the security suite-there may be something in there other than the firewall that blocks).

I do not think the UPnP being on in the router would hurt. You might even try enabling UPnP in Vuze and see if that clears the port. That way you can begin to narrow the issue.
So, you could try with McAfee disabled and if still not clear, try with McAfee enabled and UPnP on in Vuze and router.

I do not think the DHCP assigning to the other computers would be the cause, although I am not sure at all. As long as the static is set for the computer using Vuze and that IP is used in the rule in the router.


by Anonymous on 2. January 2010 - 20:56  (40067)

-Yes, I have the McAfee security suite, and yes, it comes with the anti-virus software.

-So do you mean that I might have a non-physical modem, as in a modem that is only accessible through a PC? I'm not sure if I really do have a modem, but how would I go about accessing it through my PC if I do?

-Hmm, so if I were to disable McAfee completely and the port test succeeded, then do you have an idea of what in the McAfee software could be causing me to fail the port check with it enabled?

-Even with UPnP enabled in both Vuze AND my router, I fail the port check anyways. I tried testing the port both ways, with and without UPnP enabled, and it fails each time.

-Also, I've noticed in portforward.com that it lists "Your external IP is (insert IP address here)" when I'm looking at port forwarding guides there, but this IP address is completely different than the one I assigned to my PC. Is that the missing link to my problem? Would I have to forward the port to THAT IP address, or is that something else completely different.

-Another thing: I assigned an IP address to my computer that falls between the DHCP range. Could this also be causing problems with the port forwarding?


Sorry for asking so many questions. I've been trying to find an answer to my problems with Vuze for months now and I'm aware that I sound desperate. Again, I appreciate your help very much.

by mr6n8 on 2. January 2010 - 21:51  (40073)

No, I meant a physical modem. you would not have a non-physical modem.

I still am not sure what would be the cause from the McAfee security ware, but if you passed with it off, then we would know it is in there.

I saw some threads with issues on McAfee Privacy Service and bittorrent. If there is still a Privacy service or something similar (it watches online activity-which might include bittorrent transfers), you could try disabling that to see if it is the cause.

I do not think the IP address would be an issue unless they are the same.

The reason for trying with UPnP and the security center off is to narrow down and look for solution in the right place. Unfortunately, some times even that does not help.

by Anonymous on 3. January 2010 - 1:10  (40082)

No luck. I disabled McAfee completely and still nothing. Even with UPnP enabled in both Vuze and the router without McAfee, I failed the port check yet again.

What troubles me though is when I have UPnP enabled on Vuze, I sometimes get a message saying that the TCP and UDP ports "have been changed to avoid UPnP device problems." I don't know what this could mean. Do you know?

by mr6n8 on 3. January 2010 - 13:21  (40129)

I am not sure on the UPnP error-I did a search but all I found was that it was added in to Vuze in 2006. I would guess that it is because you had the rule for the ports and that might cause conflict, but I am not sure at all.

It is not likely that your ISP is blocking a port number like the one you are using, so I am running out of ideas for you. But, I might as well check that, so Who is your ISP?

One last thing I can think of is to try a different bittorent client as sometimes that does clear things up, even though it makes no logical sense.


by ratedking on 29. December 2009 - 17:30  (39740)

what's ur email address Steve?

by mr6n8 on 29. December 2009 - 19:13  (39751)

Not a good idea to post email in fora, spambots troll these places.

I noticed my contact option had been disabled and I just re-enabled it. If you click on the keroffs at the top of this message, you will see the contact tab on my account.

you can send me email through that


by ratedking on 29. December 2009 - 19:20  (39752)

ill bear that in mind. could u look at post #40 plz.

by mr6n8 on 29. December 2009 - 20:42  (39758)

I already looked at it. I did not respond as I saw this and thought you wanted to send me something pertaining to it.

If you are getting the 200-250kB/s at private sites, then there is not an issue on the ISP. I am not sure why you did not get the same type of speed on the test torrent (but I think it might have lost its dedicated servers as a newer version happened to come out).

Since you have the green smiley, there is also no network connection issue.

The other possibility is the upload cap. Private site torrents, and the test torrent, usually do not take much upload as there is a lot of seeds to peers, so the upload cap being set too high, or unlimited, does not matter.

I know you capped and had no positive affect, so I really can not see what the issue could be.

It most likely is not the torrents as it is happening on all of them. Although I suppose it is possible if they are all small swarm torrents.

The last thing I can think of is sometimes people have an issue with a particular bittorrent client for no reason. If you want to try another one, like uTorrent, on the same torrents, let me know. I can tell you how to start them there from where you left off in Vuze.

That is grasping at straws, but it is all I can think of.


by Anonymous on 28. December 2009 - 16:28  (39666)

Why is it when i download a torrent Vuze always downloads more than it needs to? For example, a torrent of 700mb but Vuze downloads 705mb.

by mr6n8 on 28. December 2009 - 17:49  (39668)

There is usually some data that is discarded as it became corrupted in transfer and did not match the info hash of the torrent.
If you still have the torrent in Vuze, right-click and select "Show Details". On the "General" tab in the upper right is "Hash Fails". This will show the number of fails and the amount of data discarded. Unless that number is very high, there is no cause for concern.

Also, some download bandwidth is used for communications that you receive from the tracker and the other active users.


by Anonymous on 27. December 2009 - 20:03  (39618)

How come when i download a torrent Vuze always counts up to 100% (sometimes it does it twice) before it actually downloads? It can be annoying when I am downloading a whole season worth of TV show and it counts up to 100% taking around 10 mins to do so.

Can someone tell how I can avoid this so when I want to download I do not have to wait for a torrent to count 100% before it acutally starts to donwload. Thanks.

by mr6n8 on 27. December 2009 - 20:54  (39621)

If you are talking about adding a new torrent when it does this, then that does not happen for me. I am not sure which option would cause that.

Set Tools>Options>Mode to Advanced and check at Tools>Options>Files. Are any of the first four options below the Default Directory options enabled?


by Anonymous on 28. December 2009 - 1:15  (39637)

Yes. "Use best guess..." and "update default directory..."

by mr6n8 on 28. December 2009 - 11:26  (39661)

I am guessing that the issue lies somewhere on the Files options page.

Try setting a default directory (just above there) and disabling both of those and then test to see if the % counting stops.

If not, then do you have any of the next 4 options (allocate, truncate, incremental or re-check) enabled? I do not.


by Anonymous on 29. December 2009 - 1:08  (39712)

i did what u said, "setting a default directory" and unticked the "next 4 options (allocate, truncate, incremental or re-check". it went straight into download without the % counting. But there was no box where I could select which torrents I wanted to download from a folder. is it called "allocate and zero new files on creation" by any chance?

ive got another question, why is it that each time i download a torrent there is always a vuze symbol file type "vuze download". how can i get rid of it so it does not appear every time i download a torrent?


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