47452 - Typing in textarea pegs CPU

Status: VERIFIED DUPLICATE of bug 49884

(Core :: DOM: Editor, defect, P3)

Description

[Brandon Hume]

When entering a new bug, I notice that as I type into this very textarea,
Mozilla's CPU usage skyrockets, and that of Xsun follows quickly.  The text is
VERY slow appearing in the text box.

I'm running the 2.6 nightly on Solaris 8 SPARC.

I note that as I type, the slight shadow on the 'bookmarkable template' button
below is dancing about as well, so that might be the actual culprit, and perhaps
is a duplicate of the other "dancing layout" filed bugs.

Comment 1

[Asa Dotzler [:asa]]

you're running the 2.6 nightly?  what build is that 02/06?  build IDs look like
2000080408

Comment 2

[Brandon Hume]

Sorry, forgot that little bit.

I was running whatever the very latest nightly was on the day I filed this
(Thursday?), although I noticed it today (2000/08/04), on the latest nightly,
while typing into the URL bar - I was easily able to out-type the URL bar's
ability to update, and noticed my CPU usage maxing while doing so.

I also forgot to reference what kind of machine this was.  Its an SS20, at
75 MHz, using the onboard SX framebuffer.

Comment 3

[Brandon Hume]

I'm still seeing this in build ID 2000080910.  It also affects all text fields,
no just textareas, as it turns out (although the larger text boxes do make it
worse).

It makes it rather difficult to file bugs, since in the large whiteboard area
of the bug filing page, the browser only displays about one character per
second.

Comment 4

[Asa Dotzler [:asa]]

over to editor

Comment 5

[Brandon Hume]

This might be a dupe of 43914, although I'm seeing it on single-line text
areas, instead of big textboxes like it mentions

Comment 6

[rubydoo123]

assigning to mjudge to take an initial look to see what's up. Setting as perf 
keyword and m19

Comment 7

[rubydoo123]

really giving to mjudge

Comment 8

[rubydoo123]

*** Bug 47647 has been marked as a duplicate of this bug. ***

Comment 9

[Dan Rosen]

If not a dupe of bug 43914, could it be a dupe of bug 47395? I'm trying to
consolidate performance bugs related to typing...

Comment 10

[Peter Lubczynski]

Open a page with a textarea on it with NT's task manager's CPU graph visible. 
Just holding down the shift key makes my 700 Mhz computer use 16% of it's CPU!!!

In Nav and IE, it's next to nil.

Comment 11

[Randell Jesup [:jesup] (needinfo me)]

nominating for nsbeta3.  Performance on a PIII-450 (FreeBSD) is so bad that I
can get half a sentence or more ahead of it when entering bug updates (and i'm
not a super-fast typist).  'asdfkjl;' takes about 3 seconds to fully appear. CPU
gets pegged when typing in a textarea box.  I also get lots of "window moved to
offscreen positions" as I type (bug 48230).

FreeBSD fresh pull/build 09/01/2000

Comment 12

[Randell Jesup [:jesup] (needinfo me)]

Set to all/all (os/platform).  Certainly happens on FreeBSD and Linux and 
Solaris.  Appears to be due to frequent reflows (on each character)

Comment 13

[rubydoo123]

perf work, slotted for m19

Comment 14

[Randell Jesup [:jesup] (needinfo me)]

Upping severity to major since it makes Mozilla barely usable; hopefully it'll 
get addressed as soon as M18 is out.

Comment 15

[rubydoo123]

reassign to anthonyd, this may be a dup of one of his

Comment 16

[rubydoo123]

this is probably a dup of 49884


*** This bug has been marked as a duplicate of 49884 ***

Comment 17

[sujay]

verified in 9/20 build.