# Issue #66203: planner: decrease the default value (64MB) of `tidb_opt_range_max_size`

## Metadata
- Issue: https://github.com/pingcap/tidb/issues/66203
- Status: open
- Type: type/enhancement
- Created At: 2026-02-11T03:44:01Z
- Labels: report/customer, sig/planner, type/enhancement, type/performance

## Customer-Facing Phenomenon
- The second explain-stmt spent more than to finish:

## Linked PRs
- No linked PR was found from the issue timeline.

## Notes
- This issue is still open. Use this file as a reminder list for customer-driven gaps that still need a fix or a completed rollout.