Performance: late previous-playlist load
langstr at gmail.com
Wed Apr 14 15:24:00 CEST 2010
Something that irks me about starting Amarok is the long delay before
the MainWindow shows, particularly if you have a large playlist.
When I start Amarok on my "Media" virtual desktop, I can't switch to my
"Work" virtual desktop to do something useful until MainWindow shows and
X11 locks it to the right virtual desktop. That takes 13 seconds; an
I did an experiment a while ago where the previous playlist was loaded
on a QTimer::singleShot() instead of during the constructors.
I think that with a recent patch from Nikil Marathe / Nikolaj, Amarok
now contains all the patches necessary to do that.
Timings: with my 8000-track playlist, the time for MainWinow to show
goes from 13 to 3.5 seconds, which is "tolerable" territory.
MainWindow then "freezes" (stays blank) for 9 seconds while it loads the
playlist, but I'm liberated to do something else.
Could keep the Splash Screen up during that time. Future elaboration:
load the playlist in a background thread.
Some minor points:
* The QTimer call needs to go at the end of 'App::continueInit()' in
If you start the QTimer in PlaylistActions, it triggers too soon.
* It allows us to get rid of some constructor ordering trickery,
e.g. forced early init of The::playlistManager().
* In Dynamic Playlist mode, new tracks will be chosen before
'restoreDefaultPlaylist()' gets the chance to run.
What do you think of this?
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