PERF: better use of searchsorted for indexing performance #14565
Description
Follow-up on #14551
When searchsorted is used (eg as labels.searchsorted(loc)), it is important that loc is first cast to the same dtype as labels for performance reasons.
PR #14551 fixed one such example, but further actions:
- check the other usages of
searchsortedfor this pattern - add benchmarks to track the improvement