I have a Netgear WNR3500L/U/v2 running Tomato Firmware v1.28.7474 MIPSR2-Toastman-RT K26 USB VPN-NOCAT. My wireless adapter on my laptop is an Atheros AR9285, which is rated at 150mbps. I've spent hours upon hours of tweaking and testing to see if I could get speeds anywhere close to that, but my transfer rates are averaging around 9 MB/s (fluctuating between 8 to 11), which is around 75mbps. I'm mainly copying a bunch of files to a NAS (with a gigabit wired connection) and observing the reported transfer rate. Is this viewed as acceptable or is there something else I should be looking at? I have tried all the different frequencies and some yielded slightly better results but nothing dramatic. I have also enabled Frame Burst, set 802.11n Preamble to Auto, set Interference Mitigation to None, adjusted the Transmit Power to 150 and set Channel Width to 40Mhz (I have also tried setting it to 20 but that made things much worse). Obviously I am also using WPA2 Personal with AES, otherwise you cannot get the higher transfer rates.
Out of curiosity, I got a Belkin Wireless USB adapter (N300, rated up to 300mbps) but it resulted in pretty much the same transfer rates (USB ports are USB 2.0, which should be capable of 480mbps, so this should not have been a bottleneck). I saw a slight improvement, but it was not anywhere close to warrant keeping the purchased device. So, why am I only getting half the rated throughput? Is that to be expected or is there a problem with my router or it's settings? Thanks in advance for any comments.