Firefox/Projects/Startup Time Improvements/joelr notes: Difference between revisions

Firefox/Projects/Startup Time Improvements/joelr notes (view source)

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 Looking at the [https://bug514275.bugzilla.mozilla.org/attachment.cgi?id=399254 25 reflows and timings] for the "Getting involved with Mozilla..." page, it's clear that some reflows are more expensive than others. It's also interesting that there are [https://bug514275.bugzilla.mozilla.org/attachment.cgi?id=399445 just 11 reflows] for a blank page.
+<pre>
+bz: 1) try to reduce number of reflows
+bz: (e.g. make text controls not reflow sync in this setup if we can; reduce the number of text value sets if we can't)
+bz: Or see whether the reflow events we get are really needed (e.g. if the load is not done yet, why are they happening?)
+bz: But separately, it looks like reflows seem to be generally expensive
+</pre>
 Using [http://blog.vlad1.com/2009/07/28/measuring-startup/ Vlad's benchmark], I have 5.3s cold start and 0.9s warm start. Timing using the return from [http://mxr.mozilla.org/mozilla-central/source/browser/base/content/browser.js#903 BrowserStartup (JS)] gives me almost exactly the same results as Vlad's.