FE&BE - Scrollable Pagespeed Graph

Pagespeed checks need to be limited to a reasonable number, and it doesn't make a whole lot of sense to pick every nth check like we did with Monitor Details.

A visually intesresting implementation might be a scrollable graph which fetches data in paginated chunks.

        [Preloaded Chunk] <-> [ Displayed Chunk ] <-> [Preloaded Chunk]

We would fetch one page of offscreen data in each direction to ensure smooth scrolling