See https://profiler.firefox.com/public/5mpr85tj7tkxb8mhz89rcp19e6x9arewrq46h7g. This profile (from loading www.wikipedia.org in a newly-launched browser) shows a lot of parent-process main-thread I/O that relates to loading font information. We should try to get this out of the startup path.
Bug 1669855 Comment 0 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
See https://profiler.firefox.com/public/5mpr85tj7tkxb8mhz89rcp19e6x9arewrq46h7g. This profile (from loading www.wikipedia.org in a newly-launched browser, IIUC) shows a lot of parent-process main-thread I/O that relates to loading font information. We should try to get this out of the startup path.