Fiddler performance very slow

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Travis Morrison

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May 21, 2009, 9:09:15 AM5/21/09
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Chrome, an IE6 standalone, and IE7 all get slow when Fiddler is on.
The pages do load but some of the requests are taking a while. For
example, the www.youtube.com just took about 3 seconds. Some page
assets come right over and then some take very long indeed.

When I turn off Fiddler this doesn't happen. But then, of course, I
don't have Fiddler.

I searched around the FAQ, the common issues, and this group, and the
best I could find was some discussion about turning off autoproxy. Is
this the same as "automatically detect settings" in the LAN Advanced
Options box? If so, I do not have that checked.

I used Fiddler and Fiddler 2 for quite a while without this happening.
So I'm inclined to think I did something. But the best I can come up
with is that I recently expanded my browser collection to include
Safari 4 for PC, Chrome, and an IE6 standalone. Could this have mucked
with some kind of system settings?

Thanks in advance for any insight

-T

EricLaw

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May 21, 2009, 10:16:22 AM5/21/09
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Statements like "very slow" are too general to be useful, as they're
subject to very broad interpretation.

If you don't have "Automatically detect settings" checked when Fiddler
isn't running, then you're not hitting the Proxy Autodetection issue.

1> Do you have ANY proxy upstream?
2> Please email me (Help > Send Feedback) a .SAZ capture (<1mb please)
of some slow traffic.
3> What kind of network connection are you using?
4> What's the exact version number of Fiddler you're using (Help >
About)?

I run Fiddler with all browsers (Chrome/Firefox/Opera/IE/Safari) and
haven't seen any particular issues. Note that there's no such thing
as an "IE6 standalone"-- any package which claims to be an IE6
standalone is either malicious, or hacking into Windows internals in
an unsupported way.

-Eric

On May 21, 6:09 am, Travis Morrison <travismmorri...@gmail.com> wrote:
> Chrome, an IE6 standalone, and IE7 all get slow when Fiddler is on.
> The pages do load but some of the requests are taking a while. For
> example, thewww.youtube.comjust took about 3 seconds. Some page
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