Roblox Studio getting laggier with each playtest

This have been happening since a few months ago. I’ve been searching for answers on the DevForum for a while and cannot find a solution.

Anyways, straight to the point.

Roblox Studio, every time I start a new playtest, will get laggier. When I load up Roblox Studio, I get a constant 60 FPS, but after a few playtests, it can go down to 10 or lower. However, whenever I restart studio, it goes back to 60 FPS and repeat.

Thanks.