Hey League of Legends players that also happen to be Linux enthusiasts. Today I would like to share a video comparison I've created comparing the difference in performance between League of Legends on Windows 10 and League of Legends on Ubuntu 18.04 Linux. This comparison will provides a frame rate (FPS) graph and and a side by side comparison of performance between the two systems handling the same replay from League of Legends patch 9.24 from Late December 2019.
RTX 2080 8GB
i7 9700K @ 4.6Ghz
16GB DDR4 RAM
Win10 - 441.08 WHQL
Ubuntu - 430 nonfree
Wine: lutris-lol-4.20-x86_64 D9VK/Vulkan Enabled
League of Legends
Medium Settings & Shadows
240 FPS Framerate Limit (Recommend)
AA Enabled Patch 9.24B (Late Dec 2019)
Windows Average: 154
Windows One Percent Low: 120
Ubuntu Average: 140
Ubuntu One Percent Low: 106
Note: The impact of OBS with these settings is as low as ~5FPS. When running the tests I had no additional software running other than OBS and League. In a real use case even if you don't record/stream the performance impact should be similar to having Chrome/Firefox open with a YouTube video or Discord ect.
H.264 Encoder veryfast preset, 5000kbps Bitrate, 1280x720 (downsampled from 1080p)
I went on a very fruitful journey of learning about the League of Legends client or LCU API to try and find how I might go about making an automatic team searching tool for champion select. OP.GG already has an extension that does this but due to some seriously strange reasons it appears that the Korean server has different rules about how you are allowed to interface with the client. Because I am in fact in Korea and would like to use this I decided to make a work around. Anyway. I've solve both issues and I thought I could be of use to some future explorers of the League client that may be interested in communicating with it.
Rift Explorer will give you lots of options for things to look at with a few GET and POST requests. When I was testing I created a custom game lobby and read the state of the chat room and champion select. After messing around with the application I wanted to see if I was able to get the same JSON data that Rift Explorer was able to get using Chrome to create the request.
The League of Legends client hosts a local web server which is able to be found by using the data found inside of the lock file located in C:\Riot Games\League of Legends\lockfile (or where ever you might be running the executable from). This file is created when you are running the game and includes the port number which the server was created on and the password to interface with the server. This was a little confusing to find at first but using this issue https://github.com/Pupix/rift-explorer/issues/4#issuecomment-348681824 by navigating to localhost:(lockfile port) and using the username "riot" and the generated password in the lockfile you can now make requests with Chrome or any HTTP agent you like.
OP.GG extension modifications
Although you are technically able to modify the files that are located here in AppData, Chrome checks out the integrity of these files to see if they have been modified. Because of this we need to uninstall the official extension in favor of our own offline version. Since the extension is fully locally stored you can simply make a copy of the folder and place it somewhere nice like your documents and modify anything. For example I'd like to modify the part where I'm not able to use the extension here in Korea. By simply bypassing this check the application now works perfectly.
When checking out some of the options inside of the client API there are a lot of ideas for projects popping into mind. One of those would be a rewritten version of the OP.GG extension as a desktop app in C# or something. Another idea is an automatic ready check accepter. There was always talk about some kind of app or high ELO players to have on their phone so that if they walked away from their PC for a second while the queue popped they'd be able to accept the game remotely. There is a post function for accepting the match in the API so something like this would be really easy to make actually.