Do you see pop-ins when you play normally ? If you see less pop-ins, then it usually means the engine was waiting for the data.
I was afraid of overheating, so didn't bother with 7200rpm HDD. ^_^
Was considering whether I should get a HMZ-T1 or a SSD HDD.
Okay, I bought a Hybrid SSD + 7200rpm HDD yesterday for my home PS3. Will see how well it runs