The performance of updating the revision state of items depends on the used plugin. To prevent that Dolphin gets blocked by a slow plugin, the updating is delegated to a thread.
Still open issue: Applying the revision control property to the model is a bottleneck in QListView (a detailed description of the reason is in kdelibs/kfile/kfilepreviewgenerator.cpp, class LayoutBlocker). But the approach used in KFilePreviewGenerator destroys the textlayout in this case and is temporary disabled until I could track down the reason.
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