On 16 avr, 11:50, Vitali Lovich <[email protected]> wrote:
> On Thu, Apr 16, 2009 at 4:58 AM, Thomas Broyer <[email protected]> wrote:
>
> > On 16 avr, 08:30, Vitali Lovich <[email protected]> wrote:
> > > I'm pretty sure that's wrong - inserting things into a table, detached or
> > > not, will still result, AFAIK, in DOM operations.
>
> > ...but DOM operations on a detached tree is much faster because it
> > cannot cause a reflow or repaint (same for display:none DOM subtree).
> > See
> >http://ajaxian.com/archives/browser-reflows-how-do-they-affect-perfor...
>
> I think you need to re-read that. That applies to CSS not Javascript.
> Since Javascript is single-threaded (even with HTML5, DOM manipulation can
> only happen on 1 thread so this is still correct), these will not (at least
> they shouldn't from what I understand of browsers) trigger any reflows or
> repaints until the browser gets control back (when you finishing making all
> your DOM updates or if you use incremental commands).
>
> Thus you shouldn't see any performance benefits over inserting into a
> detached node or an attached node.
http://ejohn.org/blog/dom-documentfragments/
and http://www.slideshare.net/julien.lecomte/high-performance-ajax-applications
(slide 33, for example)
(and many other web resources) proves you're wrong.
> > and in general the articles inhttp://ajaxian.com/by/topic/performance
> > (you'd have to understand GWT internals to make use of some of the
> > advices; for instance, queueing [1] maps to GWT's DeferredCommand --do
> > not forget to push "pause" in the command queue-- and
>
> I believe that pauses aren't strictly necessary unless you know you
> absolutely need them because the information in the DOM won't be available
> until the next iteration of the event loop (I'm not 100% sure on this, so I
> could be very wrong).
All deferred commands are run in the same "timer tick" until a pause
is seen. So queuing 3 DeferredCommands in a row without pause won't
have the desired effect.
> > IncrementalCommand; and the memoizer can hardly be done as proposed
>
> Memoization is simply a technique for caching results of expensive
> calculations - language independant concept (even if expressed differently)
yes, hence my "as proposed" (I meant, using the code from the article,
or similar code)
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