Help me run TF2 ? (MACBOOK PRO)

hi,

i just downloaded TF2 as it just got released on steam however its running SO slow! I used to play it on a windows partition and it used to run fine then all of a sudden started to run a bit worse just as i stopped playing and deleted my windows partition.

I have no idea why it runs so slow to the point where online i can't see anyone, there is no sound and its just stupidly low fps!

Anyone know anything i can do? i have a 2-3 year old macbook pro:

2.2 GHZ intel core 2 duo processor
2GB RAM
Nvidia Geforce 8600M GT graphics card

i know it runs fine on these specs and they are above the minimum requirements! but the game just runs so bad!

oh and its not my internet... i still have a fairly low ping.

you're not the only one, i was having issues too, now its a little better. i think Valve issued an update that made it a little better
can't remember where i read it thoug, sorry