You could use multithreading to speed things up a bit.

If you want to check a bigger amount of brain wallets in a reasonable time, you have to study the underlying ECDSA math.

Just do it for satifying your curiosity, don't expect to get rich if you intent to take the funds because this bitcoin network is already being monitored by bots with very low latency network connections.

For your curiosity:
I had already checked the blockchain using a 1 500 000 000 entries wordlist and a self made cracker operating at 100000 keys/s. utilizing all CPU cores and found about ~18500 bitcoin addresses which had funds, many of them were created during a brain wallet spam attack launched on 31.08.2013.