Poor performance of HTML tiddlers in Opera

DGM

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Jan 3, 2010, 9:34:14 PM1/3/10

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I've been writing a TiddlyWiki with some HTML Tiddlers (i.e., enclosed
in <html> ... </html> rather than using Wiki tags) and I've notice
that the rendering perfromance is much worse in Opera than in other
browsers, especially as the size of the Tiddler increases.

I've quantified the problem with the following test using the latest
versions of Opera, Firefox, Safari, Chrome and IE running under
Windows XP SP2.

1. Two pages of random alphabetic text enclosed in <html> ... </
html>: ~10 seconds to display in Opera.
2. Four pages of random alphabetic text enclosed in <html> ... </
html>: ~40 seconds to display in Opera.
3. Eight pages of random alphabetic text enclosed in <html> ... </
html>: ~150 seconds to display in Opera.

There is something exponential going on here! All the other browsers
complete each test in ~1 second, as does Opera if the <html> ... </
html> tags are removed.

Does anybody know what is going on here?

Mark S.

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Jan 4, 2010, 8:59:06 AM1/4/10

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That's funny. I installed Opera because I thought it ran faster than
FF. But now I'm back to FF usually.

Just to clarify, are you using any enhancements for HTML? Like the
HTML formatting plugin?

Doug Miller

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Jan 4, 2010, 9:20:09 PM1/4/10

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Mark, no I'm not using any plugins, just a vanilla TiddlyWiki.

I've generally found Opera performance to be excellent. It only seems
to be this TiddlyWiki <html>...</html> scenario that gives it
indigestion. At first I was suspecting a bug in Opera regexp
matching, but looking at the TiddlyWiki code the regexp for <html>
parsing looks so straightforward it is hard to see how Opera could be
getting it wrong.

FND

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Jan 5, 2010, 2:25:49 AM1/5/10

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> I've generally found Opera performance to be excellent. It only
> seems to be this TiddlyWiki <html>...</html> scenario that gives it
> indigestion.

I cannot seem to reproduce this (Opera 10.10.4742 on Ubuntu).
Do you have a test case?

Have you tried creating a fresh browser profile (not sure whether this
is as easy on Opera as it is with Firefox though).

-- F.

Doug Miller

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Jan 5, 2010, 9:25:48 PM1/5/10

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On Jan 5, 6:25 pm, FND <F...@gmx.net> wrote:

> I cannot seem to reproduce this (Opera 10.10.4742 on Ubuntu).

Thanks, that is potentially good news, i.e., it would appear that the
problem is not inherent to Opera.

I'll do some more tests, including a fresh bowser profile and frech
TiddlyWiki to see if I can narrow down what's triggering this ...

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