Mobile core i5 4300U (ultra low voltage,  2 cores, 4 threads) 45H/s with aes-ni enabled on Arch Linux (built the miner from sources). Half of that without.

The last 3-4 generations of Intel core architecture CPUs support the new aes-ni instruction set, which in this case is very useful.
The GUI miner algo uses openssl to perform aes encryption. Newer openssl releases support aes-ni out of the box, so you might get ~2x speedup when mining on Linux
I'm willing to bet that Windows builds do not support it as I'm getting about 90H/s on a 4590 stock i5