rtl_tcp SET_FREQUENCY takes very long

[John Smith]

When using RTL-SDR via rtl_tcp SET_FREQUENCY takes ~1 second.

Here is the code I used for testing:
https://gist.github.com/simeonmiteff/3792676

Why is it so slow and how can I fix this?

[Douglas Hall]

Each iteration of the loop sleeps for 100ms and there are 10 iterations, so
if it didn't take ~1 second, something would actually be wrong. You should
add the output of that program to the gist in case I misinterpreted
something.