Internet browser freezes after checking internet speed/bandwidth

After installing Lion I tried to determine my internet speed by using various websites like speedtest ,speedtest.net and some more like them.
Every time when the download test was finished and the upload had to start the browser stopped.
It did not react to any commands. Only thing to do was a restart of my iMac.
This happened with Safari as well as Google Chrome.
With SL I did not have this problem.
Anybody an idea what causes this and how to cure it?
peterwillem

Could the setting of the firewall cause this?
I activated stealth modus.
peterwillem

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Please answer as many of the following questions as you can. You may already have answered some of them.
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2. Are any other web browsers installed, and are they also slow?
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Please answer as many of the following questions as you can. You may already have answered some of them. In that case, there's no need to repeat the answers.
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Quit and relaunch the browser. Any change?
Log out and log back in. Any change?
Enable Private Browsing in the Safari menu. Any change?
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So I have what I hope is a simple problem that someone from Toshiba or another user can help me with. I just received my Click 2 Pro yesterday. I was quite excited to use this machine to replace my 5-6 year old "Best Buy exclusive" Dell laptop. The Click2 works pretty well in most areas except wifi performance and I have no idea if it's my ISP (Xfinity) or wifi hardware in the Click 2 (Intel Dual Band Wireless AC 7260). So here is what I'm experiencing:
When the Click2 is right next to the Xfinity Arris TG862 modem/router, the machine runs as advertised. Everything is perfect. As I move further away from the modem, opening webpages (like yahoo or amazon) get understandably a bit slower. The results from the Xfinity Speed Test website confirm a reduction in DL speed. All of this is expected.
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Ok, since no one wanted to provide any advice, I read some other threads in this forum. It appears that many other people actually have similar issues. The P55W-based threads were quite helpful. After reading those threads, I did the following:
1) Updated the bios to version 1.5
2) DL'd two Intel updates from the Toshiba support page for this machine
3) Turned off bluetooth (which was something that supposedly helped some people with the same issues, but with machines from different companies)
4) Turned off U-APSD
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How do things compare to my Dell in the same location? Still not as good. It's about 75% as fast as the Dell where it used to be 10% as fast at opening a webpage.
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I heard about some "secret" fix in one of the P55W threads in which one must contact 'Peter" to get the machine sent to him for some type of programming magic to be worked on the machine--and at least one person seems to have gotten stellar results. If Peter or someone else in the know about this proported fix reads this, please let me know how to make this happen for my machine---be it me sending the computer in or doing it myself.

Internet browser freezes after checking internet speed/bandwidth

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