Enable an experiment causing invisible documents to be rendered when the browser detects an idle period (using https://developer.mozilla.org/en-US/docs/Web/API/Window/requestIdleCallback). This causes scrolling to these documents to be faster when a user scrolls them in view.
This experiment might cause a freeze if rendering this document takes very long. However, this same freeze will occur when the document is manually scrolled in view, either using the scroll bar or some other feature like replace.
This experiment is enabled by default.