Editor runs slower over time

What hardware are you running it on? With less than 16GB RAM, it’s pretty easy to start using the swap file. Can you confirm that your machine is up to the task?

I’ve had this problem for a long time but it hasn’t become a problem until now. The longer I have UE4 open and running, the slower it goes. I can usually work for about 2-3 hours before it becomes a problem but sometimes it’s almost immediate. The only fix I have found is just restarting the editor completely.
The main problem is with creating, saving, and compiling assets, as well as some minor FPS drops inside the viewport. After about 4 hours assets that would normally take a few seconds to load / save take minutes. A simple material edit can take up to 10 minutes just to load.