This is what Akram did to dravid just when Sachin had come in on that pitch -
YouTube - Rahul Dravid bowled superbly by Wasim Akram
When he came in ,the ball was swinging all over the place and bouncing very inconsistently plus wicket regularly falling on the other end.
Anybody even Bradman would have looked shaky in those conditions. It was a matter of gritting out and surviving ,that part.
But after he reached 40 odd and wickets were falling the attack he launched was devastating.
Just upped the ante and took control.
I did not see the perth knock live or in full,but i am sure the conditions were not as difficult as they were in Chennai plus the pressure of chasing the target and also a better bowling attack.