Re: [Dynapi-Dev] My JS Optimization Site

[Raides J . Rodr�guez Dom�nguez]

Jeff Greenberg wrote:
> 
> Hey guys...
(snip)
> This is the link:
> http://home.earthlink.net/~kendrasg/info/js_opt/
(snip)

        Ok. I have gone there and read all. It seems impressive. Just a note to
clarify things a little bit. In the "Duff's device" (something I
remember not having read anywhere, btw), you put this note:

"** IE NOTE: Internet Explorer has much better loop optimization built
in than
Netscape. Using this method, you will probably see an increase in
performance in IE,
but it will be very minor. It makes all the difference in NS though."

        Well. It's not exactly a better loop optimization, but the fact that IE
has, by default, JIT optimization turned on. JIT stands for "Just In
Time" compilation, which means that code is precompiled the first time
it's executed and then just the compiled version is executed. After the
first pass, no more JavaScript code is executed in those loops. Hence
the speed-up. Of course, loop optimization is done in the JIT phase.

        NS4.x, on the other way, is always interpreting and executing code.
That's why it's so slow. It also does the annoying thing of first
translating any "document.write" statements it finds on its
corresponding HTML *BEFORE* doing anything with the page. So page
renders are painfully slow. See
http://www.teide.net/catai/subirana/reserva.htm for an example where the
selects shown are dynamically generated in client side JavaScript. Use
IE or NS6 to see the actual source code.

        Just my 2 ptas.
        
        Raides J.

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