63917 - Table rendering is very slow

Status: VERIFIED DUPLICATE of bug 60494

(Core :: Layout: Tables, defect)

Description

[Eric Vaandering (no email)]

Rendering of some long-ish tables takes a very long time. For instance, I rent
movies via www.netflix.com. I usually have about 170 movies in my queue, so to
render the table with 170 rows takes at least 10 seconds.

I'll attach a sample from tvguide.com where I've doubled the number of entries.
This table takes about 10 seconds to come up (no preview) under mozilla and
about 2 seconds under Netscape 4.76.

Somewhere I thought I remembered seeing something about tables and bgcolor (both
examples I'm giving use it) but I can't find anything now.

Comment 1

[Eric Vaandering (no email)]

Attachment: Doubled table from tvguide.com which shows slow rendering

Comment 2

[James Green]

This took a -long- time in my 122821 build. About 15 secs to render the page,
and then approximately 10 further secs before mozilla would respond to scrolling
or hovering over the Stop button.

My machine: Debian Woody K6-2 300Mhz 256Mb RAM. I suspect this could be a layout
or parser issue, and could well be a dup. Adding perf keyword and leaving
unconfirmed for further dup triage. This needs someone with more knowledge of
existing bugs to mark confirm or duplicate.

Comment 3

[Bernd]

as the validator.w3.org shows the page has a bunch of unclosed <font> tags. And
this makes mozilla mad.

*** This bug has been marked as a duplicate of 60494 ***

Comment 4

[Diego]

Verified dupe of bug 60494: "Mozilla is extremly slow rendering this page lots
of <font> tags"
The problem is very similar, there is a table and the font tag.