Game is almost unplayable for me, but a friend with similar computer specs runs it at 60 fps?

The game is private, sorry : (

Is that game was made by your friend? If yes - he might’ve been using infected freemodels, that can reduce players’ FPS really badly.

Game is made by me and a bunch of friends, no free models at all. Only i have bad performance

No free models does not guarantee that your game isn’t infected with anything possible, try to find the virus. Malicious Plugins, Scripts from toolbox may contain such stuff too. I can give you my Discord for further assistance tho

Plugins may infect your game even if you don’t use them, this also includes your friends and other innocent people over all Roblox

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Try closing all other tabs with task manager

go over to task manager and check what percent your disk is running on, especially if the rest of your computer processes are running a bit slow

someone already told that anyways-