# performance.undoByteBudget

Part of [Performance](https://kernstra.com/docs/web-sdk/config/performance) in the Kernstra Web SDK 1.0.0 configuration reference.

- Type: `number`
- Default: `256 MiB`
- Page: https://kernstra.com/docs/web-sdk/config/performance/undobytebudget

Byte cap across undo snapshots. Oldest snapshots are dropped beyond it (at least two are always kept).

Web page: https://kernstra.com/docs/web-sdk/config/performance/undobytebudget