[gfody]

> The file reached a peak size of 150MB

is this a typo? 150MB is such a minuscule amount of data that you could do pretty much anything and be OK.

[bradfitz]

Not a typo. See why we're holding it all in RAM?

But writing out 150MB many times per second isn't super nice when both 150MB and the number of times per second are both growing.