Changing the subject a bit:
I am surprised to see how many SPARQL requests go to the endpoint when performing a ShEx validation with the shex-simple Toolforge tool. They are all very simple and quickly complete. For each Wikidata item tested, one of our tests [1] requests tens of times. That is, testing 100 Wikidata items may yield thousands of requests to the endpoint in rapid succession.
I suppose that given the simple SPARQL queries, these kinds of requests might not load WDQS very much.
[1] https://tools.wmflabs.org/shex-simple/wikidata/packages/shex-webapp/doc/shex...