Having the same problem. Normal builds are taking longer and longer. All I have in my project is 3 standard c++ classes and a 4th class marked up for unreal. All I’ve done over the last two days is add entries to a 256 item long lookup array (in the 4th class) and tested the entries as I’ve gone along, and my build times having gone from seconds to about 6 minutes. It has gotten steadily worse. (Total LOC of the whole project is <800).