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Not getting to that one this quarter. Still a good idea, but needs to become actionable, and is probably going to be a meta bug.

It is quite actionable by looking at the profiler output. It is related to bug 1378734! On the child process, you can see that highlighters actor takes a significant time in the overall setup of actors. Here is the profiler, focused on highlighters.js load: https://perfht.ml/2extfI1 (clear the search box to see how big it is compared to everything else). http://searchfox.org/mozilla-central/source/devtools/server/actors/highlighters.js Which is mainly composed of css-grid: http://searchfox.org/mozilla-central/source/devtools/server/actors/highlighters/css-grid.js How do I find this? * Make a profile * open a clean firefox * install perf-html if not already done on perf-html.io * open data:text/html,foo (to avoid unecessary noise in the profile) * start profiling (ctrl+shift+1) * toggle the inspector via the key shortcut * get the profile (ctrl+shift+2) (and stop profiling via ctrl+shift+1) * Open the profile * select the content process Sometime you have more than one, here, the one I care is the second one. You can figure out which one is what by looking at JS frames in the call tree. * Filter "JS Only" in the call tree * expand the tree and look at what takes the more time, expand over and over.

All dependencies are solved now. Do we plan to add more to this bug or should we close it?