File uploads not working right in IE.

[punisa]

I spent all day trying to figure out why a simple upload form doesn't work on my site.
The upload starts normally, I monitor the bandwidth with a small freeware app.
For a minute it uploads fine cca 30 kb/s and after that just suddenly drops to 1 kb/s...
This only happens in IE (tried 7 and 8) not if FireFox.

After the process stops it reamins idle like that for a minute or so, then it continues, but stops are random. Even if I upload a small 500 kb file it sometimes stops before finishing it and waits for a minute or two..

First I used a cgi script to show my progress, then I reverted to simple upload form.
Then I tried FTP upload from HTML form.
Always the same results.

I was just about to call my hosting provider when I realized this does not just happen on my site, but everywhere ! (youtube, wikiupload etc...)
As long as I used IE

I run Windows Vista, don't have any extra firewalls installed or anything I think could cap my upload like that.
Any clues what this is all about?

Hope my clients are not experiencing this : D

[wyweb]

Kill the bandwidth monitor and see what happens.

[punisa]

lol, good suggestion :) But I would think of that before if I suspected it might be causing trouble. I installed bandwidth monitor just recently as of today so I could have a better way of testing the problem which haunts me for days now.
Results show no problem related to this small app, it just shows kb/s, a sort of nicer replacement of Vista's ugly monitor.

Any other suggestions?

UPDATE: *sometimes* even Firefox creates a pause in upload process, but it seems much less then IE.
Also while uploading Firefox is mostly consistent, difference is maybe 1-2 kb/s during uploads, while IE fluctuates 10 kb/s while uploading (if its uploading that is)

[rocknbil]

Just offhand, I'll *guess* that this is an effect originating at your ISP, not your site or computer. As thousands/millions of users access an ISP's bandwidth, the usage for any one user is going to fluctuate as it delegates bandwidth usage to manage packets so everyone's data gets moved. This only becomes evident in large data streams, such as uploads or video.

[punisa]

I think you may be right rocknbil, as I've tried to monitor my large uploads on other service (such as Youtube), same flux happens.