Optimizing qBittorrent For Speed



optimizing-qbittorrent-speed-qbittorrent-iconThis guide shows how to speed up downloads in the freeware bittorrent client, qBittorrent. 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 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 qBittorrent, 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 qBittorrent.  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 qBittorrent, there are several other specific guides for other clients and a general guide here:
Optimizing Bittorrent Clients


Accessing The Options Screens

Parts of this guide involve accessing the Options screens of qBittorrent.  The Options screens can be accessed through "Tools" (then Options) in the menus on the upper left of qBittorrent or through the Options icon up top in qBittorrent.


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 qBittorrent running while testing the port.

Click to Test Your Port Success-just go to Adjusting Internal Settings.Error- follow all steps.

You can see the port used by qBittorrent at Tools>Options>Connection


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.

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.  Note that PortForward.com does not have guides specific to qBittorrent.  Choose a µTorrent guide and substitute qBittorrent where µTorrent is indicated.

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 qBittorrent port or for the qBittorrent program. Setting permission for the port is the safer choice. 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 - The Easy Way Enable UPnP in qBittorrent and router.

In qBittorrent the setting for UPnP is at Tools>Options>Connection


Manual Forwarding-The Preferred Way

  1. UPnP (NAT-PMP) Must be disabled in qBittorrent (see image above)
  2. Use the Static IP Guide
  3. Set permission for qBittorrent 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 Halite running while re-testing the port.

Adjusting Internal Settings

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

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 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 bandwidth and queue  options in qBittorrent.




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

Speed In qBittorrent at Tools>Options>Speed set the upload limit and leave the download limit box unticked



Connections/Upload Slots in qBittorrent at Tools>Options>Connection are the settings for connections and upload slots



Queueing in qBittorrent at Tools>Options>BitTorrent are the settings for maximum active torrents.  Torrent Queueing should be enabled.  The max active and max uploading torrents should both be set to the "Max active torrents" setting in the calculator.



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.  Setting a different port for DHT is not necessary and causes extra work on clearing the network connection.
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 these options in qBittorrent is located at Tools>Options>Bittorrent


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 Freeware Forum

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

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I tried using this guide, but nothing works for me.
I use Windows Firewall Notifier to create outgoing rules for the Windows 7 Firewall.
WFN indicates that qBittorrent is listening to the port, but when i test i get and error on the site you suggested and full stealth on the GRC site.
I don't have a router, just a wifi modem.

uTorrent worked, it was just very annoying with all the ads and having to constantly update the trackers.
If qBittorent doesn't work, i'll be stuck with using uTorrent.

When doing the port forwarding tutorial as shown above in the two links, when using a VPN which Local Area Connection info do I install is it the info in Local area connection 1 my Home Network or LAC2 my VPN into the setting up a static IP address?.

Sometimes changing these advanced options maybe helpful:

1. Maximum number of half-open connections

2. Exchange trackers with other peers

3. Always announce to all trackers

2 is definitely a valid point. 3 probably will help get started faster, but eventually the client would find all peers anyways. It is actually a violation of the basic bittorrent protocol to announce all trackers at once, but since uTorrent (and BitTorrent) do this (and they are a huge percentage of the market), it is OK. 1 should not be messed with. That was passed around when Windows put a limit of 10 max half open connections on their systems. Changing half open connections has been proven to be of no help. Anyways, when I get some time, I will add 2 and 3 in to the guide (with credit to you). Thanks Steve

Good. Thanks.