OK. Switched to OB, in case the suggested fix didn't work in stable, and applied the fix, thanks, using the provided Autoexec file. Many thanks, but it doesn't do anything for my issue. My issue is that the the framerate starts dipping in three circumstances, playing the first scenario in the Charnwood campaign (as a test scenario), flying the P51. The first time I notice it is when there's lots of flak around, which starts occurring around 10 mins in. If I'm at altitude this is so minor as to be negligible. Down on the ground it's a game-killer. The second time is when scripts or sound files load, I believe. There's an immediate hit. Happens mostly with a sound file happening, but not always - some sounds load without this issue, I mean - sometimes same kind of dip (which can be as bad as the graphics card actually stopping for a split second) with no apparent reason at all (I assume a script is loading, because shortly afterwards there will appear lots of flak, for example, or a message about an event happening elsewhere on the map). Thirdly, in the Normandy map flying low I cannot get my system to render a stutter free scene with all those trees when other things are happening. By which I mean I can fly the P51, or any other plane, on a free flight in Normandy and it's beautiful, smooth, stutter-free. But try it in a scenario with stuff going on and it's a mess. Unplayable.
I have spent around nine days at it, reading everything I could find in here, trying everything. I notice it's all very much worse with the P51 than with the F/A 18. No idea what's going on. Sick of it. Sick of trying to fix it.
My system is far from top notch. Ryzen 5 (can be easily oc from 3.4 to 41mhz but makes no diff), RTX 2070 8GB Vram (can be overclocked to from 1410 to around 2020mhz, but makes no diff), 32GB DDR4 RAM, DCS installed on an SSD.
One thing I tried was setting everything as low as possible (low textures, no shadows, no aa etc - nothing..). Made no difference to these stutters.
Various things have made a difference. It used to be much worse. The script to disable the windows game mode thing was great, for example.
So. Is there a way to entirely disable sound - so I can test that too - a way that stops the sound files loading? Anyone know? Thanks.