Library to Visualize page-load metrics

I need to visualize various time based page-load metrics for my website. I suppose the best way to display it would be something like this:

I’ve been looking in various popular graphic libraries but none of them seem to have an ability to create these sort of charts in their arsenal. All JS Gantt chart libraries I can find are tied to displaying by date, or minimum by hour.

Has anyone dealt with something like this before? Any sort of library which could help me visualize multiple metrics at millisecond resolution (like the above example). I’ve created a small d3js abstraction to help me do this, but I’d like to use something more polished.