Number of lagged frames due to rendering lag/stalls: 1247 (17.7%)
Your gfx card is not able to render the scene in time, so it drops frames
You are using 1440p and Lanczos.
you can try different things:
- disable preview (right click on canvas)
- lower ingame settings. use always vsync if available
- lower the scene resolution to 1080p
- change scale filter tu bicubic or bilinear
- change both above
- Buy a new graphics card :)
The Problem with OBS is you cant compare to a regular capture tool like eg fraps or dxtory.
the frames are captured and placed on the scene... there you can also put your webcam, text, etc.
the scene must be rendered - this is done by your graphics card and takes power.