How to Optimize QBittorrent Speeds

Note: This article has been updated with the latest tweaks as of June 2020.

qBittorrent is one of the most popular torrent clients, as it is entirely free, lightweight, and available for all platforms.

Of course, many torrent users are not aware of how to maximize their download speeds when using a torrent client. This Appual’s guide will walk you through configuring the QBittorrent client itself to achieve maximum possible download speeds.

Note: Appual’s does not condone illegal piracy. Torrents are a wonderful method of downloading legal content, and there are numerous websites that host 100% legal, public domain torrents.

Also, numerous programs out there claim to “speed up” your torrent downloads while running in the background – these are absolutely false and typically contain adware/spyware or even worse, such as keyloggers. There is no magic bullet for increasing torrent speeds aside from having proper settings.

Experiment with your DNS

If you are using your ISP’s default DNS address, or Google’s (8.8.8.8), consider experimenting with other DNS providers out there. OpenDNS is a popular alternative, and Cloudflare offers the fastest DNS available, particularly if you live in Asia.

Changing your DNS will not make you download faster, but it can help you connect to trackers and more peers, especially if your ISP blocks torrents at the DNS level.

Is port forwarding necessary in 2020?

The subject of ports and torrent software is a strange one filled with occultic wizardry. While many torrent speed guides recommend opening ports in your router, it hardly seems to matter in 2020, depending on your ISP, router model, and overall firewall configuration.

ISPs started blocking the most common ports used for torrent sharing a long time ago, but because there is truly such a huge pool of ports available, many ISPS seem to have stopped trying to block torrent ports. The reason so many guides recommend port forwarding to increase torrent speeds is two-fold:

  1. Port forwarding will manually try to get around any specific port ranges blocked by your ISP.
  2. Port forwarding allows you to connect to more peers, resulting in higher download speeds.

However, there’s something to understand about point #2. It isn’t an exact science, because even if you don’t forward ports specifically for a torrent client in your router, your torrent client will still connect to clients.

This is because some peers will still connect to “firewalled” clients, and in a large swarm with many available seeds, it will hardly make a difference whether or not you have specific ports opened in your router for torrent clients.

It also helps that qBitorrent support UPnP (Universal Plug n’ Play), so the torrent client will actually automatically search for and temporarily open the best port for you.

So in all honesty, the only time port forwarding really makes a difference in 2020, in regards to torrent download speeds, is when you are connected to a small swarm with a low amount of peers, and your router does not support UPnP. We can get a lot more technical and explain scenarios where it’s preferable to manually set ports, but this is good enough information for the average user, okay?

If you still want to manually port forward

You should test to see if the pre-configured port in QBittorrent is already open – use a website like CanYouSeeMe and, with QBittorrent open in the background, take the port from QBittorrent’s Options>Connection>Port used for incoming connections, and put it into CanYouSeeMe.

If the port is recognized as being open, you’re all good on this front. But if not, we should open a new port on your router. Doing this depends on your router model, so it’s best to consult a guide specific to your router for achieving this.

In any case, you should choose a port between the 49160-65534 range. This is because the old port range by torrent programs was typically 6881-6999, but many ISPS started blocking those specific ports. You also want to avoid ports that are shared by other programs, and the range given above should not already be in use.

After you forward the ports in your router, change it also in the QBittorrent options, and test again with CanYouSeeMe.

If you want to be absolutely certain there won’t be any conflicts with the ports you want to use and other Windows programs, you can open a command line and type:

Netstat -a >c:\log.txt

This will do a scan of all ports in use and save a logfile. When you read through the logfile, you’ll know which ports are already being used.

As far as opening and forwarding ports on your router, there are many router-specific guides out there, so we simply can’t give a “one size fits all” guide here.

The Swarm: Seeds, Leeches, and You

One important thing you should understand is how seed/peer ratios work.

Everyone downloading or uploading a torrent is part of a ‘swarm’. If the swarm has more downloaders (leechers) than seeds (uploaders), than everyone in the swarm will experience slower download speeds, because the seeders automatically try to share a fair ratio between all of the leechers connected to them.

Imagine it like this. 1 seed has a maximum upload speed of 100Kbps. 10 leechers are connected to this seed. So the seed will try to upload to those 10 leechers at around 10Kbps each (100Kbps/10). If only 2 leechers were connected to the seed, they would get around 50Kbps. So here you can see how easily torrents become very slow when there are more downloaders than uploaders.

That kind of situation can be common in public trackers, such as on well-known torrent websites.

Private trackers (swarm networks) try to compensate for this by giving download speed priority to known seeders with high upload ratios. These trackers are usually found on private, membership-only websites, and you will be given a higher download speed priority the more you share back in uploads.

So if you completely download a torrent and let it upload for awhile and get a nice big upload ratio (1:1 or higher), you will be given a much higher priority the next time you download a torrent from that tracker. So for the best possible download speeds, after following the rest of this guide, you should consider joining private tracker groups and having an above-average seed ratio.

Change your peer sources

One thing that will help you find more quality seeders is to change your peer sources in QBittorrent’s settings.

qBittorrent DHT and PeX

  1. Go into Tools > Options > BitTorrent tab.
  2. Enable the checkboxes for “Enable DHT” and “Enable Peer Exchange”.
  3. Disable the checkbox for “Enable Local Peer Discovery” unless you’re on a large campus or LAN network.
  4. Set encryption mode to “Allow Encryption”.

So to explain these settings briefly. DHT and PeX peer discovery help you to discover more peers globally, which means more possible seeders for you to download from. Also, some trackers or peers will only connect to encrypted peers, for privacy, so by allowing encryption you are also widening your pool of potential peers.

Local Peer Discovery is only useful for trying to find peers on the same ISP or LAN as you. It might be useful if you belong to a huge ISP or are on a big college campus LAN with lots of people that share the same music interests as you, for example, but you also need to be wary of your ISP inserting their own trackers into popular torrents to try and catch you downloading/uploading stuff you shouldn’t.

Also, Local Peer Discovery is useless if you are using a VPN, and since you should be using a VPN while downloading torrents for better privacy, it’s best to just disable Local Peer Discovery.

Adjusting your maximum download and upload speeds in Qbittorrent

Many guides for tweaking torrent speeds recommending limiting your download and upload rates to around 80% of what you’re actually capable of. This is sound advice, but you need to understand why.

ISP plans typically offer higher download than upload rates. So for example, let’s say you are paying for 25Mbps download, and 5Mbps upload as your internet speed plan.

Now you are downloading a torrent, while uploading another torrent at the same time, both at the maximum of your download/upload speeds. If you are uploading a huge amount of data at maximum speed, your upload lane becomes full.

If you try to download big files at the same time, you’ll still need some upload bandwidth to signal to the seeder that you are in fact receiving data from them. But if your upload bandwidth is already clogged up, this query/response is going to get lost in all the data, resulting in slower download speeds.

Asymmetric connections like WiFi, ADSL and cable are especially prone to this, especially WiFi, but it can happen on fiber-optic connections as well. So if at all possible, you want to avoid doing massive download/uploads over WiFi and try connecting directly to your modem, but you also want to limit your download/upload rates in QBittorrent’s settings to around 80% – 90% of their maximum.

Now, a bit about finding your maximum download / upload rates. Some ISPs are known to give priority to speedtest websites, so the results shown to you on Speedtest.net for example may actually be manipulated by your ISP. Your results can also change throughout the day, depending on peak traffic in your area.

Speed Test

So what you really want to do is try a few different speedtest websites, perhaps at different times throughout the day, and find the average between them. The best speedtest websites are:

  • Speedtest.net
  • Speedof.me
  • Testmy.net
  • Fast.com

Once you know your average maximum download and upload rates, go into QBittorrent’s settings and adjust accordingly to around 80 – 90% of the maximum average for both.

Conclusion

This is the end of our guide, which covers the basics for most users. If you still encounter any difficulty in downloading torrents, leave a comment and we may be able to help, but realize that there are many individual factors to consider. Also we do not condone illegal piracy.

Tony Celentano


Tony Celentano is a traveling freelancer originally from New York, and currently resides in the Philippines. While passionate about writing, his other hobbies including tinkering with gadgets, painting, playing guitar, and being a stay-at-home dad.

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How to Optimize QBittorrent Speeds

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