Firefox looking up DNS issue

So so so slow...
Seem this issue can be fixed by starting a new profile. Here is the list of the Add-ons I installed
Start a new profile:
C:\Documents and Settings\Administrator\Application Data\Mozilla\Firefox
Open profiles.ini
Add
[Profile2]
Name=Frank
IsRelative=1
Path=Profiles/7bbtrocp.Frank

Open Firefox, Firefox will ask you to select the profile.

Bugs of Firefox 3.5.1

I found the same issues too, before the version 3.5.1

It takes too long time to open a new page

Sometimes, it shows "Loading" on the tab, while on the status bar, it's "Stop"

The status bar will keep on showing "Looking up (some website)", this will last for a long time, while using other browsers is with no problem