Hello! First of all, I could not figure out if I am supposed to report issues that occur while using Proton with Linux. If not I apologize. This bug occurred on all versions of Proton I could install and get to run via Steam(which includes the current experimental, 4.2-9, 6.3-7 and 5.13-6). I also tried this on Stable and Frontline. The Bishop fight in Pillar Mountains has extreme lag for me. Whenever a lot of Bishops are on screen and especially when they throw projectiles, the game sometimes freezes for up to 30 seconds. I could not record a significant spike in resource usage (GPU, CPU and RAM stayed at the normal usage levels). I could record a video and upload it if that would help at all. I'm on Kernel 5.10 Stable Manjaro Linux. I use a GTX 1080 with 470 proprietary Nvidia drivers and an i7-6700K. I experienced only minor stutters at best in any other fights and areas of the game, so this doesn't seem normal to me. I labeled this as a Crash because it seemed to be the best category, but the game doesn't actually crash. Thanks for making such a great game, I'm having a lot of fun with it!