In the VAB it appears that a large part of the memory allocation is caused by the UI that displays the parts on the left.  This appears to use some rather non-optimal LINQ queries that result in large amounts of garbage, the more parts being displayed the more memory is allocated.  In a stock game the extra allocation over sitting in KSC varies from approx. 400 KB/s for the smallest part group (command and control) to over 5 MB/s for the largest (utility).  Having lots of part mods installed gen
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