XHRs appear under the "Resources" tab of my web inspector, so I guess by that right they're resources on the page :) But you're right -- the latency histograms

XHRs appear under the "Resources" tab of my web inspector, so I guess by that right they're resources on the page :) But you're right -- the latency histograms for static resources are very different than for dynamic resources. So while the probabilities do suggest that most users will encounter at least one 99th percentile latency, it's very different if that latency is for a static resource vs a dynamic one. Thanks for pointing it out.