Delay between Ajax Request received and javascript code running

[batman42ca]

I'm having an odd error and I don't know where to look to debug it.

I'm using Firefox 3.5.3 (problem exists with IE6 as well), with
Firebug 1.4.3 and mootools 1.2.4 on Win2k.

I send an Ajax request (via POST) and get a response within about
200ms (no problem). Then often (not always) there is a delay (big
problem) of a few seconds, then my javascript code to process the ajax
response runs for about 95ms (no problem).

Using the Friebug Net tab, I can see that the Ajax request response is
fast, and the profiler shows that the javascript code to process the
response runs fast. I can't see what is causing the delay between
receiving the Ajax response and the execution of my javascript code to
process the Ajax response.

Before I go through the process of reducing the code to something
simple that I can post here that still exibits the error, I'm
wondering where I can look to discover the cause of the delay since
Firebug profiler shows no Javascript code running during the long
delay between the receipt of the Ajax request response (as witnessed
in the NET tab) and the execution of my javascript code to process the
Ajax response and it doesn't happen every time, just most of the
time.

I've cross posted this on a mootools forum hoping someone there has a
clue but my question here is a little different.

Can Firebug do anything to help me discover the cause/location of the
delay? The Net tab, profiler, even the Error Console, offer no clues.

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[batman42ca]

I've since discovered that the behaviour changes when I change
servers. One server shows the delay, the other does not.

So, since the Firebug Net panel shows the delay occurs after the Ajax
response was received and before my javascript code is triggered to
process the ajax response, what effect could the server have? Is there
further communication with the server after the ajax response is
received and before my javascript code is triggered to respond?

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[Honza (Jan Odvarko)]

> So, since the Firebug Net panel shows the delay occurs after the Ajax
> response was received and before my javascript code is triggered to
> process the ajax response, what effect could the server have?
I would recommend to use Firebug 1.5b1 + Firefox 3.6
http://getfirebug.com/releases/firebug/1.5X/
http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-1.9.2

Important bug was fixed in Fx3.6 and the Net panel timeline is more
accurate.

See also my blog post:
http://www.softwareishard.com/blog/firebug/firebug-http-time-monitor/

Honza




On Oct 27, 4:51 pm, batman42ca <batman4...@...> wrote:
> I've since discovered that the behaviour changes when I change
> servers. One server shows the delay, the other does not.
>
> So, since the Firebug Net panel shows the delay occurs after the Ajax
> response was received and before my javascript code is triggered to
> process the ajax response, what effect could the server have? Is there
> further communication with the server after the ajax response is
> received and before my javascript code is triggered to respond?

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