So I know there are similar questions on Google, but they had something to do with their Nvidia driver, which I don't have or any way to get it (I'm just a kid, I don't have enough knowledge to go through my PC stats and get an Nvidia driver or whatnot).
I did try the reducing lag methods (such as going into Roblox studio and turning off frame manager and changing the render distance to a lower resolution), but I still get stuttering frames, just barely-noticeable but gameplay-changing amounts of lag and just overall server lagging (pressing a key and the function of the key happening about a second later, people teleporting and such).
This isn't my PC problem - my 2 PCs had no problem running Roblox about 2 days ago, then one day I turned on my wireless PC and it just seems to have lag. I thought this may be just it being wireless and tried my wired one, but that had the exact same problem. I also tried disabling my antivirus on my big PC, which did seem to get rid of a tiny bit of lag but still lagging the same way nonetheless. Others seem to not have this problem, re-installing or restarting the PC doesn't work, and Roblox didn't update until today (which still lags). This is extremely frustrating, any help will be appreciated.