After updating DCS to the latest version, removing the "Run as Admin" flag, and adjusting some settings to reduce CPU load, things seem to be improving. On an online server (up to 30 players), stuttering has disappeared (though I need to test more thoroughly). All cores are running well.
The internal DCS Frame Rate Counter (locked at 120, as I use a 120Hz G-Sync monitor, 32") sometimes turns red, indicating a CPU bottleneck. The last core appears to be running significantly higher than the others (100%). The GPU is running at 70%, so I assume I could push it further with different settings.
I don’t think I can optimize much more—while the RTX 2080 Super has some headroom, the CPU (i5-9600K) seems to be the bottleneck.
Maybe I can offload more from the CPU and shift more load to the GPU, but I need suggestions for additional settings