http://jacob.j-e-b.net/nicehash.png

http://jacob.j-e-b.net/nicehash.ods

This was taken using a 1 minute counter and a 1% averaging. No compensation for ramp up/ramp down (integrated solution would have that) and no hashrate recovery.

The lower two are X11 and X13 on "nicehash control", the upper two are scrypt and sha256 on "p=xx", with the initial hashrate for scrypt misconfigured.

Looks good to me (looks better when the graph is not that compressed), more after work...