Hello again,
I tried plenty of settings (in game and on nvidia panel), uninstall last nvidia driver 446.14, test with older ones. nothing work. Enable/disable full screen mode optimization, windows game mode.
Overal FPS are good with my config (50 fps with GPU 1080TI, I7950 3.2 Ghz, 12 mb RAM, 500 Go SSD) but this heavy stutter every one minute kill the game.
I noticed in flight and i put on screen FPS and several all parameters (keys Rctl and pause) that "video mem" is always equal to 0.00 mb.
I DCS 2.5, I had always a value between nine and ten mb.
I took a screenshot and attached it.
For me game is unplayable in 2.5.6...
Hope somebody find a solution:(:(:(
Regards