How to optimize WGR614v4 wireless router?

when i'm connected through wifi on my router, my download and upload speeds are basically cut in half from when i connect directly into my modem. i know people have complained about the throughput from forums i've read, but is there a hacked firmware or any optimal settings like changing the MTU or have the SP1 firewall disabled, etc.? please help if possible (also, my PS3 won't even connect unless i'm plugged into it)