Viper displays cause frame drop despite GPU and CPU are not at 100% utilization

[TOViper]

Hi!

Today I wanted to fly on Buddy Spike Blue Flag Syria 80's today, but stopped and made a short video instead:
https://www.youtube.com/watch?v=abZIOFS9SeI
In the video you see, that when I turn the TGP and WPN pages ON by switching from NAV to A-G mode, the utilization of CPU and GPU don't change much, but fps fall down to 40.
DCS and the 1920x1080 screen (60Hz) are synced together using NVIDA control panel setting "Vertical sync Adaptive", the DCS option "Vsync is OFF.
I would have expected that the utilization goes up in order to keep constant 60 fps, but actually I don't understand what is happening here ...

VRAM is at 100% utilization (NVIDIA 1070 GTX with 8GB).
Processor is a AMD Ryzen 5 5600G.
DCS Openbeta 2.7.11.22211
Windows 10 Pro / 21H1 / 19043.1526 / Windows Feature Experience Pack 120.2212.4170.0

DCS settings below in the picture.

Edited April 16, 2022 by TOViper
typo

[toutenglisse]

1 hour ago, TOViper said:

...In the video you see, that when I turn the TGP and WPN pages ON by switching from NAV to A-G mode, the utilization of CPU and GPU don't change much, but fps fall down to 40...

Hi, I did a quick 2d test and I see different things, with my settings. (My screen is 75hz gsync-comp and at first I had no fps drop - VR friendly settings... - , so increased ingame what is available, forest and scenery, and got fps drop from 75 to 69-70 when TGP+Mav are on)

Fps drop happend at the same time than GPU increasing usage (70% to 99%). Usage also increased on 3 out of 4 cores (about 40% to 60-70%. the other core was always between 50 and 60%).

The thing I found curious on your video was the object count. On my side it is very stable and goes from 340 to 580 (with TGP+Mav). On your side it goes from 350 to a blinking 350 and I don't know what other merged number.