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Error indication & badging was generally slow during the tests and did not allow participants to work effieciently. In some cases, missing indication/underlines (not yet computed) lead participants away from the currently open file thinking it is without any issues (which was not true.
Would appreciate profiler snapshots.
I saw this issue repeatedly on the usability sessions. Unfortunately, on my computer error indications in editor are appearing and disappearing very quickly after I modify project's properties (remove or put back a necessary dep). Needs more work on reproducing.
I'd suspect the slowness observed in the usability sessions was mainly due to bug 189406.
Closing fixed in 7.0.