itch.io

i havnt heard of that one before, but if you join the discord it has a dedicated bug report channel i recommend using. =3

well is true that saiko can lag your game by collision spam or other type of bugs but i didnt heard about getting constant lags by just her getting closer, you tried to verify the files of the game through steam? that could help, if it doesnt works you can try to update your graphic drivers. try to play in other resolutions to see what happens or try to restart your graphic card  (like uninstalling and restarting your pc through device administrator) try to check on admin task the performance of the game when she gets closer, maybe you can find the reason why this happens, like high CPU temperatures or high ram usage or graphic card most likely i think that gpu would be the problem, if nothing of this happens then go to Saiko No sutoka Discord server (https://discord.gg/7V3pusP) and go to #bug-and-glitches channel then report the problem in there, because it would be probably a bug of the game that has bad performance with your graphic card or something related to that, also tell about what graphic card you have then maybe habu (lead developer, who codes the game) has a solution for this bug (if it's one)