Does your Materials UI Load Really Slowly in Revit 2012 ?

We found that on one project, the Materials Browser would load very slowly when the ‘Appearance’ tab was activated.  If the dialog was closed and re-opened with the ‘Materials’ tab activated, there was no lag.

The Solution?  Purge your Render Appearance Property Sets (make sure you know the implications of this).

After purging these, the lag went away.  However, and it is a big ‘however‘ – this resulted in some of our renders no longer working correctly.

If I first went into the few materials that used property sets and set them to ‘By Property Set’ and not ‘Independent’, Revit did not purge the necessary data and the renders were still ok.

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