On Thu, Apr 16, 2009 at 1:27 PM, Pascal <[email protected]> wrote: > >> > Creation of individual DOM elements in javascript seems to be pretty slow >> > (it is a bit faster in the new generation browsers ff3, Safari4 and chrome) >> > but setInnerHTML() doesn't create those elements in javascript, it is done >> > natively in the browser and thus is much faster. >> >> I'd need to see a benchmark that that is indeed the case. I don't >> have time right now (I'll experiment later if I have the chance). But >> it seems wrong that creating the DOM elements in javascript is slower >> than having the browser do it natively (the cost of modifying the DOM >> should be the dominant factor by far). > > Seriously, this is not even close. In IE for a table as small as 50 > rows with 15 columns, you're looking at a few seconds with the DOM and > below 100ms with innerHTML. (on a dev laptop here anyway). Me thinks there might a problem with your testing methodology. First I think you're not taking into account the building of the string whereas you do time the widget creation. Secondly, if you have a constant 50 rows & 15 columns, see how long it takes to set the data once you've pre-created your widgets (this should actually be faster I think than innerHTML if you have HTML elements there). Thirdly IE is the slowest browser (Javascript is actually notoriously slower - not sure about DOM, but even that is still slower than any other browser). At least tell me you're testing with IE7 (which is still what, 2x slower than FF3.0 & 5 times slower than FF3.5). Fourthly, I'd prefer to use something like Firebug's profiling rather than trying to instrument my own code - it's far less likely you'll make a mistake or misinterpret the data I think.
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