I’ve been watching this problem since the first page of this thread since its been affecting me since 4.19.0. Initially it was tracked down to particles, but I always knew there was more to this story. I haven’t worked with any projects that contain any of the causes listed here so far, yet I still experience the stutter. I’ve recently started working with UE4 on my laptop (surface book) in the last few weeks. The book can barely run UE4 as it is, yet surprisingly, no stutter. When I work on my desktop, it starts stuttering within 5 min until it cripples the engine.
For reference, both run Nvidia cards, and both have been working on the same project recently. Obviously there are severe stat differences in the machines, yet the more powerful one is suffering and the laptop isn’t.
Agreeing with that this can’t be just a hardware. I’ve had the same hardware since I started with 4.13. 4.19 is the only engine version that produces this problem. I’d love to help solve this, but I really have no idea how to track down the cause.