So I finally tracked this down. Official releases of 17.0.2 vs 18.0.1
In v18, if the OBS screen is visible / being redrawn, frame rates go down, roughly in half.
In v17, this does not happen.
Both perform equally well if the OBS window is hidden. It's the case of OBS window being drawn that has the problem.
I cannot find an option to disable the update/draw in the window.
OS 10.9.5.
Logs attached: V17 (one run, both covered and not). V18 (covered, no problem). V18 (uncovered ... ARRGH. NOW IT WORKS?!?!?)
... So quantum intent / future affects present proven: intending to upload a bug report, and it works fine :-).
baaahhh
In v18, if the OBS screen is visible / being redrawn, frame rates go down, roughly in half.
In v17, this does not happen.
Both perform equally well if the OBS window is hidden. It's the case of OBS window being drawn that has the problem.
I cannot find an option to disable the update/draw in the window.
OS 10.9.5.
Logs attached: V17 (one run, both covered and not). V18 (covered, no problem). V18 (uncovered ... ARRGH. NOW IT WORKS?!?!?)
... So quantum intent / future affects present proven: intending to upload a bug report, and it works fine :-).
baaahhh