Best way to profile on raspi

[ThuGie]

Just overclocked to High, Turbo fails so.. added heatsinks.
And i am staying below 50c so seems nice . when doing
time echo "scale=3000;4*a(1)" | bc -l
btw.

What is best way to see avgr chunk generation speed ?

Edit:
I talked to soon it seems, even after stopping benchmarking temp did not drop.
And it seems temp just keeps rising even when doing pretty much nothing.. might be the casing though no air vents.