roachperf: high core-count regression around February 16th #76738
Description
Describe the problem
Please describe the issue you observed, and any steps we can take to reproduce it:
https://roachperf.crdb.dev/?filter=&view=kv0%2Fenc%3Dfalse%2Fnodes%3D3%2Fcpu%3D96&tab=aws
https://roachperf.crdb.dev/?filter=&view=kv95%2Fenc%3Dfalse%2Fnodes%3D3%2Fcpu%3D32%2Fseq&tab=aws
The same day we see marked improvements in the lower core-count workloads. Presumably this is all due to #76350, but we should bisect and profile to understand.
cc @Azhng 😓
Jira issue: CRDB-13255