Am Montag, 30. November 2015, 21:05:02 schrieb dt-l...@stefan-klinger.de: > 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?
When thumbnails are color managed we have to pass all thumbnail pixels through lcms2 before painting them on the screen. Could you also try setting "plugins/lighttable/preview/full_size_preload_count" in ~/.config/darktable/darktablerc to 0? > Thanks for looking into this! > > Stefan Tobias
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