For some reason this game runs at like 20fps at lowest graphics settings. Is there any reason why. And are addons like FPS-Unlocker allowed because in the game rules it doesn't mention this?

I might be a little late to answer this but I was asking the exact same question but since no one looks at Roblox forums that much depending on the game I never got an answer I feel like it would be allowed since Roblox at RDC 2019 said it's allowed but that not speedrunning. But since for frame rules and milliseconds could be affected by fps unlocker by making it unfair. But I feel like fps unlocker would be allowed since Roblox allows it and it's so hard to tell if a speedrunner is using fps unlocker. If you have 20 fps unlocker won't help your computer since Roblox is locked at 60 fps per second for good computers and if your computer is at 20 fps it won't go any higher unless your computer is locked at 60 fps.