Grim Dawn Version 1.1.5.2 Hotfix 2

[Flix]

I use this utility available here to alleviate the CPU issue:

A(nother) way to reduce CPU clogging / smooth the experience

Like some of you, I too found Grim Dawn weighing heavily on just one CPU core while the others are twiddling their thumbs most of the time. Then I remembered that some games in the past have had issues with Hyperthreading. To cut to the chase, apparently so does Grim Dawn. Using the Task Manager to set CPU affinity to every other core starting with core 0 checked and core 1 unchecked lessened the clogging on core 0. Instead of at or near 100% core load in Devil’s Crossing right after loading th…

If CPU is your bottleneck it should help. I also highly recommend trying the in-game Deferred Rendering option as well, which improved performance dramatically for me.