Safari 6 Slow PDF Scroll and Behavior !!!!

! Hi !
I've just upgraded from Lion to ML and noticed something wierd. If I open a pdf link in Safari 6, and the embedded PDF viewer starts, safari becomes Slow scrolling the PDF and sometimes Stops for 2 pr 3 seconds.
Is Anyone having the same problem?
Can someone help me?
Best Regards,
Stejimenez

Just adding my $.02 here as well, Safari Version 6.0 (8536.25) seems buggy, for example, right now none of my keyboard shortcuts work, changing tabs, back, or the mouse gestures like back or scrolling do not work.
for clairfication I'm on a Macbook Pro 17 OS X 10.8 2.8 GHz Intel Core 2 Duo 8GB 1067 MHz DDR3.
I use the following key commands in chrome and used to use them in Safari before Mountain Lion upgrade:
⌘ ← to go back (doesn't work in Safari 6.0)
⌘⌥← (or ⌘⌥→) to switch tabs (doesn't work in Safari 6.0)
I use the following gestures in chrome and used to use them in Safari before Mountain Lion upgrade:
two-finger vertical swipe to scroll (doesn't work in Safari 6.0)
three-finger horzontal swipe to the left to go back (doesn't work in Safari 6.0)
Through further testing I think it's site specific, gestures do not work while on stackoverflow or facebook, but do work on w3cschools and wordpress.org -- huh.
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