[Jhsto]

I could hear my hard drive screeching when I was looking at the transition on the topmost container. Even though the moving background looks nice, I'd still prefer to sustain my battery for bit longer. Your site just ate 2% of it.

[mtrpcic]

I doubt it was your hard drive screeching you heard. There's nothing happening on that page that would be writing to disk. Maybe the fans were going nuts trying to keep the CPU cool.

[pXMzR2A]

Could be swapping in and out of ram to disk? That makes a lot of noise (from experience).

[lgierth]

Might be the CPU too. My previous laptop with a first-gen i5 made quiet, but audible screeching noises sometimes.

[nacs]

Most likely just your CPU or case fans picking up speed to compensate for higher CPU usage/heat.

Pretty sure you wouldn't be able to hear the actual CPU,.