Hello there, I wanted to come to report that Im having this as well. The hitches start off as small but as I keep the editor open they seem to get progressively worse, I dont have the epic shooter pack assets or really any particle in the level though. Cant remember having this at all in 4.18 but ever since I upgraded to 4.19 it started happening…
windows 10
gtx1070
i7 3770
16gb ram
soundblaster z soundcard