`timeZone` causes bad performance due to slow re-renders
Author: mciudoiuCreated Nov 11, 2025Updated Mar 18, 2026
Labelstime zone
Using timeZone significantly affects performance slowing down re-renders by up to 15x.
Having some disabled dates and modifiers additionally increases this time.
To reproduce
CodeSandbox: https://codesandbox.io/p/sandbox/daypicker-bug-report-forked-8lrc7t
Actual Behavior
Re-renders are very slow.
Expected Behavior
Be as fast as when not using timeZone.
Source: gpbl/react-day-picker