It’s kind of spreading and doing the fps down to 10.
I have tested many ways of finding virus: I was typing “Fire” and “Spread” in explorer, typing getfenv and getinv in find in scripts, also tried typing require. What else I can do to find the virus?
I’d suggest you searching for Script as well in the explorer and check ones that you have added since this issue is happening. It is also great if you are using free models to check the whole model if it isn’t containing something malcious.
I’d try searching for Instance.new or scripts you do not recognize. Check any plugins, deny script injection and make sure you have the official version of everything. You can also check in the developer console, under Scripts you can see which script is currently being executed. Might be really hard to catch tho. To help with your search, try switching to server mode and see if the fire is still there. If not, it’s a LocalScript causing it.