Running the throughput test for Q3 and stale ok shows a regression between builds 877 and 892. The test is tuned to do 350 qps and with the later builds it does between 230 and 300 qps.
The daily sanity servers have fewer cores than the weekly crank servers and are a supported configuration.
Logs are attached. If there is a suspect change, let me know and I will run the test with that build and the prior one.