> is there a way to determine whether Trackster is the cause?

The only place where Trackster caches data is in the SummaryTreeDataProvider. 
In galaxy-central, the relevant line is  709 in 
lib/galaxy/visualization/genome/data_providers.py :

CACHE = LRUCache( 20 ) # Store 20 recently accessed indices for performance

Try setting the cache size low or to 0 and see if that addresses the memory 

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