We need to be able to send certain info to apps on startup to prevent them from immediately turning around and sync-asking for stuff on startup. We already know of several sync child->parent messages that slow app startup down, so finding them and sending that info immediately should eliminate a bunch of dead time. There's fullscreen at least (bug 1003848), also PSms things (see bug 952875 comment 11).

Vivien, at some point you had a list of such messages, right?

I believe that the spot we'll want to modify in the parent->child direction is probably PBrowser::SendLoadURL...

(In reply to ben turner [:bent] (use the needinfo? flag!) from comment #1) > Vivien, at some point you had a list of such messages, right? The one I was looking for were: http://mxr.mozilla.org/mozilla-central/source/dom/ipc/PBrowser.ipdl#218 http://mxr.mozilla.org/mozilla-central/source/dom/ipc/PBrowser.ipdl#218 http://mxr.mozilla.org/mozilla-central/source/dom/ipc/PBrowser.ipdl#278 There was also bug 1003848 as cited already. IIRC that's all what I was seeing as obvious sync calls while starting the template app.

I fix this issue implementing the persistent registration of Service Worker. Now in LoadURL we have a BrowserConfiguration object that can be used.