Extremely Slow when Opening a new tab

I have just bought my new Retina MacBook Pro after my 3 years Macbook Pro 13" is total lost and get the Mountain Lion OSX with latest 10.8.2 version
After migrating the MacOSX from Snow Leopard to Mountain Lion, my Mac is everything ok but without Safari.
Once I wanna open a webpage from bookmarks bar, I usually open a new tab then click one of webpage in one of the bookmarks bar. The problem was happened in this action.
After I opening a new tab which I have set to show top site rather than History (all top site are locked like a set of bookmarks), the system extremely slow down even I just move my mouse from one bookmark to another on the bookmarks bar, it still have a bit serious delay more than a second.
I have just tested, if i choose history not top site is shown when I am opening a new tab, the performance really better. However, when I scroll to somewhere all have thumbnails for those webpages, the performance still slow down but not yet as serious as the top site and I think becasue I have choose over 12 webpages for topsite (which are all have thumbnails).
My new Retina MacBook Pro is the lower default spec i7 2.3GHz and the version now is MacOSX 10.8.2 with Safari 6.0.1
one of place I want to mentioned is my Safari and Safari Webpage Content are over 500MB once I have opened. Is it common and normal? I feel really upset that my new Mac doesn't really faster than before but the older one is Core 2 duo and 4GB ram vs the new one is i7 2.3GHz and 8GB ram....oh my god

Try clearing history and the cache...
From your Safari menu bar click Safari > Reset Safari
Select:  Clear History  (also empties the cache)
Deselect the remaning boxes then click Reset.
Quit and relaunch Safari.
See if that made a difference.

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