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

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

1,083 bytes added , 3 September 2009

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 = Current status =
+=== September 3, 2009 ===
+On reflow...
+<pre>
+bz:so there are a few things we could talk about:
+bz:1) make any given reflow pass faster (this is hard)
+bz:2) reduce number of reflow passes
+bz:s/this is hard/this may be hard/
+bz:So one place to start would be seeing why we're doing reflow at all
+bz:that is, what things cause posting of reflow events and what things trigger reflow in their post-reflow callbacks
+bz:and seeing whether we can reduce or eliminate them.
+joelr:post-reflow callbacks?
+bz:see comment 1 in the bug
+bz:firefox has about 4000 elements in its ui
+bz:which means about 4000 boxes to reflow
+bz:modulo optimizations, etc
+bz:BoxReflow is the reflow of a single box
+bz:those are the two things to look into
+bz:reducing number of reflow passes
+bz:and speeding up individual passes
+bz:if you have info on what parts actually take up time during reflow, we should look into that
+bz:I would also be interested in the number of nsIFrame::Layout calls you see during startup
+bz:that's a more interesting metric to me
+bz:esp. if we can chunk it up per reflow pass
+</pre>
+= Previous statuses =
 === September 2, 2009 ===
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 ...
 </pre>
-= Previous statuses =
 === August 30, 2009 ===