Krita 4.0.3 keeps freezing everytime I add a brush stroke.

I'm trying to draw something and I changed my brush and after I changed it Krita keeps freezing every time I add a stroke. I tried lowering my graphics settings and everything like every troubleshooting website is telling me but it won't work. I should mention I am on a Mac and I am using a drawing tablet(the Huion H420). I did try changing the brush and it didn't work either. Changing the memory settings didn't work and neither did restarting my tablet or Krita itself. Using my mouse isn't working either, it won't even do anything when I use my mouse. The thing is, every time I attempt to draw or add a stroke with my drawing tablet, it will freeze for like 2 minutes until I can use the application again. The canvas size is 1536 by 2048. The canvas isn't very full it has some text that I gave a sperate color border, a line and my attempt at drawing a flower(what I was trying to draw when it froze). The file is like 4mb large so it's not like my computer can't handle the size of the file. The computer I'm using is a 2015 MacBook Air and is fairly up to date (upgrade wise). This has never happened before. I just downloaded this version of Krita today and I had been previously using 3.3. Thanks for the help :).