My best advice is to “soldier through” but here are some tips:
1.Don’t zoom out really far, more zoom = less lag.
2.Have an isolated “lag area.” In my new game I have a lot of code for animating tiles with REALLY long (and could probably be optimized lol) equations. Whenever I am in that area the editor its really laggy so I put it in a far corner, if you have “lag equations” then isolate them.
3.When making multiple assets at once or a really big asset switch to the “Assets” tab because it’s less laggy than the blocks tab. Also name every asset.
4.This might not be true but I swear the app version of makecode is like 10% better in terms of lag. Its also less prone to This Glitch. So I use the app version.
5.Listen to music! Waiting for anything to load is easier!