WRT310N - very slow compared to ethernet

I was reading through firmware upgrade threads on this model, and before I upgrade, here's my issue.
Comcast higher speed cable.
I get 35 Mbps with the computer wired via ethernet directly to the cable modem.
Both of my computers have built-in N network cards.
Using the WRT310N, both computers achieve a max speed rating of 5 Mbps upload, max of 1.6 download.
That's an amazing difference in speed.
One Macbook 
One Azus notebook running Windows 7.  Both test out about the same speeds.

I belive you should upgrade the router with a latest firmware first  
And regarding the speed is concerned.. Did you checked if you plug the ethernet cable with the router into your computer does the speed increase or not..  Looking into the details that you have mentioned i belive its all wireless
If that is correct .. If yes then you can try to change the wireless channel on the router try with channel 6 , 9 or 11 and observe the connection..

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