No MT plus SSAA 2x at 1080p resolution, vsync on.
With MT plus SSAA 2x at 1080p resolution, vsync on
With MT plus no SSAA 2x at 4k resolution via DSR, vsync on. You can see that the FPS drops. So it should be with SSAA because SSAA and DSR have practically the same performance.
Remembering that the DCS with MT I had a gain of approximately 10FPS in that same mission.
DCS without MT, vsync off.
DCS with MT, vsync off.