Open your League of Legends client and enter a Custom game. To increase the FPS of League of Legends on Windows 10, you can change the FPS cap settings to a custom value. If you are also troubled by the League of Legends FPS drop issue, the following methods will show you how to fix it. As a big fan of LoL, you might have encountered various LoL errors such as unknown Direct X error, login unexpected error, and the one discussed here. League of Legends is a widely popular multiplayer online game around the world.