I bought 16" MacBook base model little over a year ago and did the mistake of updating OS to Big Sur. I didn't even care about everything being slower than it was in Catalina, but the simple case of typing lag was really irritating. Only solution after trying everything, was to clean install Catalina back and everything was ok again. I did this like few days ago, so I actually used Big Sur for 1 year without any solutions or improvements for slowness. I think Big Sur is just not for Intel Macs and Catalina is the last OS for them. Few interesting points I noticed in Big Sur, that I have not found elsewhere from internet: If you keep moving mouse via trackpad while you type, there is no typing lag. If you keep YouTube video on screen while you type, there is no typing lag.

Hello, I've been having typing lag problems when using intel gpu and it seems that gpu is running with too low speed when there is no load for it, because lag goes away if I watch video at same time I type (still using intel gpu). So I was just wondering how to change the minimum running speed of Intel gpu to fix this. I have Macbook pro 16" 2019.

Macbook Pro 16", typing lag with intel gpu. Safari scrolling lag with both gpu's. All started after big sur update. Hopefully fix is coming.