114572 - Long delay constructing javascript menus at sou.edu

Status: RESOLVED WORKSFORME

(Core :: DOM: Core & HTML, defect, P4)

Description

[David Finch]

It could just be a fluke with my computer, but whenever I visit a page at
www.sou.edu, all the mozilla browser windows lock up together for about 10
seconds after the page has loaded.

The only thing I can think of that might be related to the cause is the script
tag at the bottom of each page for the menus.

Also, I noticed that whenever one browser window crashes, they all crash, which
shouldn't happen if they were all seperate processes. I have Quick Launch enabled.

I'm using build 2001112009

Comment 1

[Matthias Versen [:Matti]]

I see a very short freeze on my system (0.5sec).
What system do you use (CPU ..)

BTW: All Mozilla windows are one process and not seperate processes

Comment 2

[David Finch]

I have a 500mhz Celeron. 128 mb ram. 

Comment 3

[Karl Johan Kleist]

I too notice a delay, about 5 s on my 850 MHz PIII machine. Build ID: 2001 12 10
03. Windows 2000.

Maybe the JavaScript implementation of string concatenation in Mozilla
is very slow? Extract from "http://www.sou.edu/INCLUDES/HMenus/HM_Loader.js":

if(HM_IsMenu) {
	document.write("<SCR" + "IPT LANGUAGE='JavaScript1.2'
SRC='/INCLUDES/HMenus/HM_Arrays.js' TYPE='text/javascript'><\/SCR" + "IPT>");
	document.write("<SCR" + "IPT LANGUAGE='JavaScript1.2'
SRC='/INCLUDES/HMenus/HM_Script"+ HM_BrowserString +".js'
TYPE='text/javascript'><\/SCR" + "IPT>");
}

Comment 4

[Boris Zbarsky [:bzbarsky]]

That script loads the menu system for the site.  This involves construction of
thousands of objects, lots of walking the DOM (no one has accused HierMenus of
being implemented efficiently) and so forth....

Comment 5

[joakim_46]

I also experienced a 5s lock with build 2001112009 under Windows Me.

Comment 6

[Chu Alan]

freeze for ~15 seconds on Pentium II 350MHz on linux build 2001112012. (oops)

Comment 7

[Asa Dotzler [:asa]]

->DOM

Comment 8

[Sivakiran Tummala]

i did not see the problem on win2000 2001-12-07-03

Comment 9

[Sivakiran Tummala]

changing priority to P4

Comment 10

[David Finch]

I'm still getting 10 second delays with build 2002-02-08-11
500mhz Celeron. 128mb ram.

Also, unrelated, with the latest public release the Mozilla window pops back up
when I try to minimize it and there are no other windows showing. It's really
annoying. I have to move it out of the way or close it to get to my desktop.
I'll post another report for that.

Comment 11

[Johnny Stenback (:jst)]

Mass-reassigning bugs to [e-mail]

Comment 12

[José Jeria]

Menues on this site are fast and work well with  Gecko/20031114 , can anyone
verify and mark as WORKSFORME?

Comment 13

[Fabian Guisset]

The page works fine for me using Firebird0.6 on linux. The menus take a while to
load but the page is responsive while they're loading. David could you please
test this bug again? Thanks!

Comment 14

[David Finch]

I went ahead and tried it again. The pause was less than a second, same 500mhz 
celeron as before (though last time I had Win98, now XP), and with a cd ripper 
in the background. So I guess that either the performance has improved over the 
past 2 years or the menu script was fixed after the university switched to 
Mozilla as the default browser on its lab computers.