Okay, so I have Krita 3.3.3 and my Krita was laggy before I got this, so I downloaded the newest version, but the lag never went away!!! And, it lags a TON!!!

I am sure this was very cathartic, but if you want help, you should provide actual information about your system, what you actually mean with "lag" -- everyone seems to have their own idea about that, and information about the size, color model and channel depth of your images.

But first you should check the faq: https://docs.krita.org/KritaFAQ#Slow_Brushes

I'm kinda reposting. Apologies if it's again rules. I'll delete if that's the case.

The FAQ is pretty much on point. I was experiencing the same issues.
Hope my feedback has some use.

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So I got Krita ver 3.3.3

I was experiencing the same lag issues and google search brough me here.

I noticed that Krita tends to have notable perfomance drops using anything above RGA/A 8 bits.

I was lagging heavily on every draw.

I did the following.

Perfomance -> Disable vector optimizations (AMD CPU)
Display -> Untick Canvas graphics acceleration

I was getting good results with DX11 instead of openGl, but results seemed even better with no graphics acceleration.

I'm working with an EVGA Geforce 1060 (6GB) GPU
Ryze 1500 (3.2ghz), 12 virtual cores.
Canvas is 300dpi, A3 Size, so around 5000x3000.