I have the same issue. Since updating to v6.4.31, moving a single part on my 4-layer pcb design takes upwards of a minute to redraw (my PC is older!), making it almost impossible to work with. This happens even if it's only connected with ratlines. It used to be that the part moved straight away, but the tracks and/or ratlines redrew themselves after a delay, but now the initial movement of the part isn't redrawn.

Did anyone find a solution to this? I'm trying to redesign a board that I initially made with 2 layers that worked without issues in EasyEDA, with 4 layers. I currently have around 400 objects or 60 parts and whenever I try to move anything the page will completely freeze for a solid 20-30 seconds, making component placement a pain.

"I'm trying to redesign a board that I initially made with 2 layers that worked without issues in EasyEDA, with 4 layers." If you mean that your original PCB was designed as a 2 layer board and that was ok in EasyEDA Std but you are now trying to redesign it in EasyEDA Std as a 4 layer board then yes you will have problems like this. You should not but sadly you will and this behaviour has been  reported many times in the forum. EasyEDA Pro is supposed to handle multilayer design much better. I cannot comment further because I have not used either version for multi-layer designs other than simple examples to investigate a few user's forum posts. You may be better off posting this as a new Bug Report.