Formula-heavy browser spreadsheets freeze because automatic recalculation runs on the main thread, blocking rendering and input handling. Switching to Manual Calculation Mode in the Syncfusion React Spreadsheet Editor stops formulas from recalculating on every keystroke, keeping the UI responsive. The post walks through enabling manual mode via the `calculationMode='Manual'` prop, using built-in ribbon commands to recalculate by sheet or workbook, and triggering recalculation programmatically with the `calculateNow` method. Guidelines are provided on when to use automatic vs. manual mode based on workbook size and workflow type.
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