Mike Pinkerton wrote:
> Just doing some _very_ cursory testing, it appears that the macEmbed
> harness (a powerplant app that embeds mozilla) is faster at layout out
> pages than mozilla navigator. Here's what I see with two equivalent
> debug builds (same tree):
>
> - first, I commented out the throbber in macEmbed, which is an animated
> gif using ImageLib. In macEmbed, loading cnn.com locks the machine for 3
> seconds (this is a debug build) but then the entire page displays in one
> shot -- images and all. At this point it's done.
>
> - with mozilla, it locks up for the same 3 seconds, but what displays is
> just the webpage text, the images have yet to load. The images then
> trickle in over the next 5 seconds.
>
> - then i put the throbber back into macEmbed, and the images all loaded
> more slowly (they weren't there at the initial blit of the page, but
> finished loading more quickly).
>
> Why are images loading so slowly? It seems that animated gifs of any
> kind _really_ hurt our performance, especially page loads.
I ran debug versions of mozilla and macEmbed (PP Browser) built today
from the same tree. Testing was done loading www.cnn.com. I wiped the
cache folder of each program before running each test. I have a 1.5
MBit/sec DSL connection so all of my times are a bit longer tan Mike's.
* With mozilla, most of the page came in in about 9 secs, then the
images finished and the page fully loaded in 15 secs.
* With macEmbed, it did not display in one shot. It drew in the same way
as mozilla but the times were 7 secs for most of the page and 10 secs
for all.
I then copied the sleep time calculation from nsMacMessagePump and
put it in macEmbed. This didn't seem to make a big difference - only a
second or so. This is where I thought the difference would lie, but
apparently not.
I then commented out the animated gif throbber in macEmbed, and that
made very little difference.
So, our measurements are different but one thing is in common: The
embedding app is faster. I am not sure XUL is the culprit. Needless to
say, it will take some more measuring.
-Conrad
