This sounds like your fan might be broken or can’t properly cool the system. My Computer’s fan is broken and also has the exact same issue where perfomance swings from good to bad (albeit in every application), usually after having it on for a little bit.
im assuming this is either a graphics, or ram problem.
i looked up your laptop model and it can AT MOST have 8 gigs of ram, if not less. thats a BIG, like BIG yikes for a game like combat warriors. for graphics, it can once again, AT MOST have an mx450, which is pretty much a worse 1650.
as someone who used a crappy laptop for years, i salute you. 
It’s not a RAM problem. If you run out of ram then your OS just gets extremly slow. I am guessing it’s a thermal issue.
As you can see from his past message (FPS drop from 60 to 14 Frames Per Second - #28 by Leviszke1) OP has 16GB RAM in his laptop. So it’s probably not a RAM shortage issue. His GPU is a NVIDIA GeForce GTX 1650 with Max-Q Design which should be more than enough to run most, if not all Roblox games. It’s most likely a thermal issue but it could also be a Roblox issue.
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oh, didnt see that! yeah its probably a thermal issue then.