# performance.renderCacheSize

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

- Type: `number`
- Default: `5`
- Page: https://kernstra.com/docs/web-sdk/config/performance/rendercachesize

Rendered pages kept in memory, those on screen included (never fewer than the visible pages + 2), when pages render on demand: over 50 pages, a smaller document too large or slow to render whole, any document on a phone or tablet, or once the render worker is running.

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