Optimizing µTorrent (or BitTorrent) For Speed

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Optimizing-utorrrent-speed-uTorrent-iconThis guide shows how to speed up downloads in the freeware bittorrent client,  µTorrent. All bittorrent programs need to have their incoming and outgoing communications flow freely in order to achieve the highest download speeds and that is what this guide is about.  This guide will also work for users of the BitTorrent client as the µTorrent and BitTorrent clients are identical.

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 µTorrent, 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 µTorrent.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.

This guide will work for all versions of µTorrent and BitTorrent 6.1 (and later). Screen shots are from µTorrent 1.8.2 as the options menus had been changed starting with that version.

If you are looking to increase your download speed in µTorrent for Mac, see Optimizing µTorrent For Mac.

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

There are several other help articles for and BitTorrent here at Gizmo's.  A listing is on this page:

µTorrent & BitTorrent Help

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.  Have µTorrent running while you test the port.

The port that µTorrent uses is at Options>Preferences>Connection
The port number in your µTorrent should be entered at the port test site.
The Randomize port each start option should be disabled as this could affect router and firewall settings and rarely serves any useful purpose.


Enter the port number from your µTorrent here at the test page and press "Check":


Click to Test Your Port 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 and the press "Enter".  This will check to see which ports are being used and save a text file called "log" at C:\.  Looking at the log.txt file, you will know which ports to avoid.

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 µTorrent port or for the µTorrent program. Setting permission for the port is the safer choice.
If you are using Windows Firewall, then all you have to do is go to Options>Preferences>Connection in µTorrent and enable the Add Windows Firewall exception option.

Otherwise, 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.

UPnP (NAT-PMP in Apple) - The Easy Way Enable UPnP (NAT-PMP in Apple) in µTorrent and router.



Manual Forwarding-The Preferred Way

  1. UPnP (NAT-PMP) Must be disabled in µTorrent (see image above)
  2. Use the Static IP Guide
  3. Set permission for µTorrent port. This should be set to allow both TCP and UDP communications.
    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.  Have µTorrent running while re-testing the port.

Adjusting Internal Settings

The most important setting here is to cap upload in µTorrent to 80% of your overall upload capacity. Setting upload in µTorrent 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.

Note:  (Thanks to Roderunner for reminding me of this)

µTorrent does have a built in speed test and Setup Guide (Options>Setup Guide) that will automatically adjust settings in µTorrent. This is a slightly quicker process than this guide.  However, my testing of the Setup Guide settings versus the calculator of this guide showed better speeds with this guide. 

First of all, the setup guide only offers settings for certain upload rates.  So if your upload rate falls outside their offerings, the settings will not be as precise as those in the calculator below.  Even if your upload rate matches one of the offerings exactly, the automatic settings of µTorrent for that rate are not as effective as the ones given by this calculator.

There is not much more involved in entering the settings from the calculator into µTorrent and the increase in download speed will make it worthwhile.

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 µTorrent 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 active on 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 µTorrent - Screen shots of locations in µTorrent of settings to be adjusted 



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.  Local Peer Discovery should be enabled as it supposedly searches for peers on your ISP or those on an extended network or on a LAN party. it can be very useful on a LAN party.  I have not found it to make much of a difference when not on a LAN or extended network.

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.

These settings are at Options>Preferences>BitTorrent and should be set as in this image:


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 Anonymous on 1. November 2009 - 22:00  (35604)

Thank you a lot, I got a file (10.2 gb) that went from 1.5kb/s more or less, to around 50kb/s and 60kb/s!! (few seeders though).

Best regards from Mexico.

Keep up the good work!

by Anonymous on 17. October 2009 - 8:32  (34852)

it stays the same even after the speedtest and the configuration from the calculator..

i know i got the port forwarding correct bcoz i have green icon at the bottom says "Network OK"
the highest download i got was around 25 kB/s.
i have 256kb connection plan, is it affecting my download speed?
should i have to live with it? ;-)
have i missed anything?

by mr6n8 on 17. October 2009 - 12:05  (34863)

It is your connection plan.
The 256 is in kilobits (kb)
uTorrent shows speeds in kilobytes (kB)
8kb = 1kB so 256kb = 32kB which would be the max speed and figuring in some overhead, the upper 20s would be top speed in uTorrent.


by Anonymous on 17. October 2009 - 12:59  (34865)

oh, did you mean i am already getting just the right download speeds possible for my connection plan?
unless i upgrade my plan... upper 20s all i can download?? ;-0

by mr6n8 on 17. October 2009 - 13:00  (34866)

Yes that is correct.

by Anonymous on 15. October 2009 - 13:25  (34704)

I am trying to sett up a port but all ports seem to be blocked even with my firewall disabled Trend Micro Internet Security pro
Please help!

by mr6n8 on 15. October 2009 - 13:34  (34707)

Do you have a router or modem?
If so, what is the make and model?

Do you have any other security software on your computer?

I am not familiar with Trend, but several of the security suites have some sort of internet protection separate from the firewall that will block P2P.
I will look around and see if I find anything.


by Anonymous on 15. October 2009 - 14:01  (34711)

NAvini Networks Ripwave MX modem

I have created a Program Control rule that gives uTorrent the permission allow both TCP and UDP communications.

Thanks for your help! I hope we can beat this!

by mr6n8 on 16. October 2009 - 11:39  (34782)

I looked around and found nothing special on either the modem or Trend Micro. Hopefully we can narrow the issue down and try and figure this out.

The Program Control rule that you created-was that for the firewall? Did you allow communications in and out?

Have you tried disabling the whole Security Suite while testing at canyouseeme?

Are you connecting through a network, such as a school or business?

by Anonymous on 16. October 2009 - 18:07  (34811)

Yes I allowed both tcp and udp in and out

I tried with trend micro disabled DIdnt work

Network: ISP from home

What else can I tell you that might help?

by mr6n8 on 16. October 2009 - 18:17  (34812)

Running out of options.

Do you have any other type of security software or internet monitoring software on your computer?

Who is your ISP?
Is the modem from your ISP?

The other posts mentioned the firewall disabled and this one says trend micro-did you try the canyouseeme test with all, Anti-Virus etc, of Trend Micro disabled?

by Anonymous on 17. October 2009 - 4:32  (34843)

Nothing else

Freedsl www.freedsl.mg they are run by Blueline which would be the actual service provider

YEs the modem is from them

Yes I did try the canyouseeme with trendmicro completely disabled

There was a period last night when the "green light" at the bottom of uTorrent screen came on This morning it is back to the red warning triangle

As far as I know nothing changed between the two incidents.


A friend referred me to your website a week ago. It is really neat! Thanks for providing this service!

by mr6n8 on 17. October 2009 - 13:10  (34867)

I could not find much on those ISPs (those names make for hard searches), but I will keep looking. It is looking like an ISP issue.

I see that Blueline has a Fair Use policy, which indicates they have the ability to interfere.

Given the green light at night, it is possible they are blocking daytime and not night. Were you getting better down speed when it was green?

What kind of speeds are you usually getting on torrents and what was your down speed on the speed test?

May have to try the uTorrent beta and uTP transfers to see if that helps.

by Anonymous on 5. November 2009 - 7:41  (35872)

Sorry for the long delay. Was out of town

The green light are coming on at random times. Sometimes during the day sometimes during the night. I cant discern a pattern, eg after 6 or whatever

I get about 20 or 22 kB/s when its REALLY MOVING!


by mr6n8 on 5. November 2009 - 16:35  (35963)

Welcome back.

What was your result on the speed test for download speed?

On the green light, is it changing while uTorrent is running?


by Anonymous on 11. November 2009 - 3:48  (36370)

No change

Fastest I get is around 25KB/s

It seems as if my bandwidth is limited by freedsl/blueline (Any hackers out there who would care to solve this for me?? Just a joke!!!)


by Anonymous on 22. August 2009 - 9:50  (31314)


by Anonymous on 18. August 2009 - 19:28  (31098)

THANKS A LOT!! went from 15kbs to 250 in Bit Torrent!!!!!!!!!!!!!!

by Anonymous on 18. August 2009 - 18:34  (31093)

i wanted to speed up a torrent that had 9h 45m left on it so i stopped it and did these tests and lo and behold it fell to 1h 25m i need to do the speed test on all of my computers!

by Anonymous on 3. August 2009 - 18:39  (26207)

My router is from my internet supplier(telus) and so has built in bandwidth limits. I'd love faster speeds than it allows, but this guide helped me max out my connection. Thanks.

by Anonymous on 1. August 2009 - 23:13  (26128)

OMG! had 20 something then its gone up now to the hundreds!!!!

by Anonymous on 30. July 2009 - 1:27  (25996)

All I can say is wow!!! I've acquired download speeds of up to 560 kB/s. Before doing this, the most I've had was like 120 kB/s. It took a while for me to figure out and understand all the directions you gave because I'm a novice but it was worth it. Thanks! Wish I could smoke with ya!

by Anonymous on 30. July 2009 - 1:52  (25998)

Darn Comcast!! It settled down to about 230 kB/s but still it's amazing for me!

by Anonymous on 29. July 2009 - 4:01  (25911)

OOOOOkay a little overwhelming at first but in the end it's worth it. my download speed SKYROCKETED from 24 to 120 kbs!! Thanks soooo much!!

by Anonymous on 26. July 2009 - 0:37  (25765)

This one of those seeding guides that i thought meh aint gunna help, decided to try it anyway and boy ami glad, my speeds shot straight up, and now im really pleased.

Great guide just what my torrents needed


by Anonymous on 19. July 2009 - 12:52  (25362)

thankss man,..
claps 4 u guys

by Anonymous on 16. July 2009 - 8:58  (25181)

Wow, you guys all have horrible connections! Mine went from 400-600kb/s to 1-2mb/s, with a peak of 2.5mb/s!

by Anonymous on 18. August 2009 - 21:27  (31116)

mine went to 10.6mbps :)))

by Anonymous on 13. July 2009 - 22:52  (25033)

i saw a spike in my download. Great guide! WHOOO *claps for you guys*

by Anonymous on 9. July 2009 - 14:20  (24828)

thanks man first my downloading speed was 5kb/s now it is 40kb/s

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