Regular FPS drops when looking at the ground on Caucasus

[IRRE_Schwarzy]

I tried back on my 2D screen 3440x1440p (to see the difference between VR), and I can say that it is quiet normal, about 120 fps constant with the same quick mission F4 free flight caucasus, sometimes a quick 90 fps during 3 seconds on near the grounds and it comes back directly to 120. Always CPU bound in red on this mission, but with the F18 free flight I switch between GPU bound green or cpu bound yellow with 210 fps.

It seems to be especially a VR problem with my reverg G2, maybe open xr ?

Edited June 14, 2024 by IRRE_Schwarzy

[Glide]

You should enable the advanced settings in the OXR Toolkit.  Then enable the advanced FPS counter which will help drill down on the area of issue.

You will see that on the Caucasus map, the terrain geometry makes the sim work a lot harder depending on the direction of the view port.  This took me down a long learning journey that I'm just recently finishing.  It seems the Caucaus map affects the rdr CPU frame times which will go from 5ms up to 14ms+.  With just Quadviews, Low Latency Mode = Ultra, and very low settings in my Pimax Cystal at 65% resolution, I got 120fps in my dogfight mission on the Persian Gulf map.  Didn't think it was possible.  That has to be the best performing map right now, IHMO.

[Schwarzy]

Thanks for your post, this is first time I read somebody else has performance problems with Caucase... Do you find any solution to improve it ?

[IRRE_Schwarzy]

Now in VR my FPS are not so bad since I have lowered the textures, but even with 70-90 fps, I regularly have huge frametime, some regular peaks that destroy the fluidity (and fps during a fraction of second). I wonder if my pc is bottlenecked by the graphics card and its 10gb of vram only (rtx3080) or by the i7 12700 kf processor? Would switching to an rtx 3090 with 24gb of ram improve the fluidity of VR? On some hard server like enigma, my fps can be downed to 20 fps (cpu bound?).

In the FPS window, I am nearly always CPU bound, even alone on a single mission with no units, that is strange.

In the task manager, my cpu never exceed 45%, and my GPU is often 75-80 % with all VRAM used, but sometimes it is only 40% with huge frametime.

I tried in 2D in a small dcs windows (small resolution) just to see what happen. In the f18 free flight mission (no unit on the ground), I have in this case 300 fps (max fo dcs) and very little frametime, but stiil CPU bound Yellow, sometimes quickly GPU bound green.

If I use 2D and 3440*1440 resolution, I have max 230 fps and green GPU bound

 

Same thing but with the F4 Free flight mission caucasus (there is a lot of units in this quick mission), with a small resolution I am totally CPU bound RED, max 130 FPS, and some times huge frametime. If I use 2D and 3440*1440 resolution, I have exactly the same performance, 130 fps. It would say this is really a cpu bound and not GPU ??

 

Edited July 6, 2024 by IRRE_Schwarzy