Just chiming in here with a similar experience. I’m also getting a stutter/hiccup on 4.19 every 30s or so for a quick second, then it recovers. Usually only after the editor has been open for about 30min. Nothing odd in task manager. The stutters are either too quick for them to show up on usage stats, or Its not affecting my PC at all.
I’m at work and don’t have my PC driver specs handy, but its any map, any circumstances. Happens on both launcher build and source built version. I originally thought it was because I had both builds installed and didn’t really think anything of it until I saw this thread. When it starts to bug me, I have just been saving and re-opening the engine.
No effect on any other software, just a quick hiccup in the engine itself. I can check driver version later tonight. (also Nvidia though)