said by ChrisUK:You likely don't have a router issue, you have a wireless distance issue. Simplest thing to do is move the router closer to where the PS3 is located, the router can hang off any coax outlet in the house.
My PS3 is only reporting about 6 Mbps download speed from my Actiontec Rev C. The YouTube app suffers from constant buffering. I tried switch wifi channels, but speeds get worse.
Is getting a newer Actiontec likely to help? I'm concerned that the reduced range of the newest version might make things worse.
Another cause for slowdowns could be you have other wireless devices, like other computers and they are using part of the bandwidth
You can also have a second MOCA device , most use an old Actiontec as a LAN bridge and then you can run wired from the PS3 to the second Actiontec ( the FIOS FAQ has many options )