475606 - Browser not responsive while loading HTML5 spec

Status: RESOLVED FIXED

(Core :: DOM: HTML Parser, defect)

Description

[Hixie (not reading bugmail)]

STEPS TO REPRODUCE
1. Load the HTML5 spec (single-page version). There are some snapshots below.
2. Try to interact with the browser while it is loading.

ACTUAL RESULTS
Browser isn't very responsive.
Also, the page takes quite a while to load, especially the full version with CSS and JS.

EXPECTED RESULTS
The page should display, complete and fully interactive, as soon as I've decided that I want to see it.
Or, alternatively, if that's too audacious, then it should render quickly once it's started downloading.

TESTCASES
http://damowmow.com/playground/bugs/slow/html5/full/
http://damowmow.com/playground/bugs/slow/html5/static-html-only/

Comment 1

[u88484]

Hixie, those links are dead.  Do you have a working link?

Comment 2

[Biju]

http://www.whatwg.org/specs/web-apps/current-work/

I think this issue is due to multiple problem.
PC 1 
  a) with JavaScript disabled, I dont see any problem at all
  b) with JavaScript enabled, First few seconds (say 10sec) browser 
     response is slow, but user can scroll. Then JS kicks in, 
     and browser hangs for a minute or two. After that user can 
     work with out any problem.

PC 2 and 3
  a) with JavaScript disabled, scrolling is very slow
  b) with JavaScript enabled, browser just hangs

Comment 3

[Henri Sivonen (:hsivonen)]

The current live spec mostly WFM, but I have a fast computer.

Comment 5

[Wayne Mery (:wsmwk)]

I see only a 1-2 sec delay on https://html.spec.whatwg.org/

Comment 6

[Marco Castelluccio [:marco]]

It's still pretty slow for me. It depends on which machine you're using.

Comment 7

[David Bruant]

how much faster do you think this can get?

Comment 8

[Marco Castelluccio [:marco]]

The browser is no longer unresponsive when loading https://html.spec.whatwg.org/ now.