[da-anda]

Problelm: The UI is not responding (well) on several occasions, f.e. when addons get installed/updated/extracted. IMO UI has to be responsive no matter what happens in the background. There shouldn't be any stutter, lags or whatever.

Solution: not sure, maybe move those stuff to their own threads and only keep core parts processed in main thread (UI, input, output)? Or move the UI rendering to a dedicated thread with high priority?

We need specifics. All add-on installation/updating happens off-thread already. The reason it's slow is usually due to all the disk access + logging.

It mostly occurs right after startup, so when XBMC is still loading stuff and skins fire their scripts. So yes, XBMC is already busy. Maybe we should add a delay for the addon update check?
But sometimes I also noticed some 2-5 secs lag while browsing the library or alike and an addon got installed(manually triggered).