On 2015-Nov-30, Tobias Ellinghaus wrote with possible deletions:
> Am Samstag, 28. November 2015, 13:37:41 schrieb dt-l...@stefan-klinger.de:
> > I have the impression that lighttable is reacting much slower in rc2
> > (and master), than in previous versions (I am not using OpenCL, never
> > have).  When moving around the mouse cursor, the highlighted thumbnail
> > lags behind about one third of a second.
> 
> Could you try disabling "color manage cached thumbnails" in the core tab of 
> preferences and see if it becomes faster?

Yes, it gets about 30% faster, but the lag is still prominent when
coming from 1.6.9.  To get a more solid base and not just feeling, I
have taken screencasts and counted the number of video frames it takes
between the mouse pointer entering the slide and it being highlighted.
An average over 15 measurements per darktable version/setting yields:

    1.6.9:                  2.53 frames
    rc2.0, CM'd thumbs off: 6.23 frames
    rc2.0, CM'd thumbs on:  9.11 frames

The screencast was taken with 29.970 frames/s, which makes the old
version of DT take less than 1/10 of a second, and the new one between
1/5 and 1/3 of a second.

What does CM have to do with it?  Is it more than the slide frame
painted in light gray?

Thanks for looking into this!

Stefan


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