online performance with long window optimization degrades after upgrade

**Bug Description**
- online performance with long window optimization degrades after upgrade
- after re-deployment, the performance looks normal

**Expected Behavior**

**Relation Case**

**Steps to Reproduce**

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The issue mentions 'long window optimization' and performance degradation after an upgrade. Start by examining recent changes to the windowing logic in the codebase, particularly around performance-critical paths. Look for any related tests or benchmarks that measure online performance. The goal is to identify what changed in the upgrade that caused the regression and verify that a re-deployment temporarily fixes it.

Written by the indexing model from the issue text.