In the past i struggled to play in a smooth way to Raise of the Tomb Raider; my setup includes a 1600x1200 screen resolution and a gtx1060
Fps at high settings were between 40 and 80, a big range!
Sadly, activating vsync in the game locked the fps to 30 or 60 and force nvidia composition pipeline ended up in a jerky motion even when using strangle.

So... by pure mistake, i left the kwin opengl compositor enabled (with vsync on/full scene repaint) *AND* enabled vsync in the game too.
Then i started the game with strangle to lock the fps to 60, and, to my great surprise, the fps in the game was not locked to 15/30/60; there was no tearing, and the game was incredibly smooth at 60fps, and good at 50fps too!
The downside is 1 or 2 frame lagging, and the usual 5% performance loss due to the compositor running (but force full composition pipeline has the same overhead, so...)

I've yet to try this with other vulkan games

Somebody could explain why the game is now able to keep the frames in sync with the vblank but not limited to 15/30fps when it drops under 60? Where is the "magic"?

Thanks.