[Ronsenshi]

I've never tested its throughput - there was no reason to do that because all of the processed images are saved and stored as long as those files are accessed at least once a week.

So, the answer is pretty much this: it'll handle as many rps as nginx serving static files can handle.

If we are talking about unique requests each requesting to process unique image - I'm pretty sure linode server CPU it's running on will choke.