Hi Tim, Noticing that you mention working with most of the references turned off you might find performance is better if you create a series of sub-master composition files that have smaller groups of references attached, this kind of structure: To view the relevant files for plant A open plant A sub-master, to see the whole plant open plant master with Nesting Depth set to 1. As you mentioned compression these notes may be helpful: What does 'Compress File on Exit' do? Compress Options Compress Options in AECOSim Building Designer - Behaviour and Configuration Compress Options can affect Drawing View performance [in AECOsim Building Designer] There are several other factors that can affect performance. Some suggestions are made in the following articles: Visibility Calculator performance issues Batch Update of Cached Visible Edges (CVE) in AECOsim Building Designer [essential reading #1] Drawing Rules, Auto Annotation and performance [essential reading #2] In ABD SS5 we have added ABD SS5 - BB_DG_ECSCHEMA_CACHE . This speeds up the Element Information dialog. There have been significant improvements to application performance in SS5 and we recommend that you upgrade to it as soon as practicable.
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