It's not too bad once you open up your router ports. I ended up forwarding seven single ports and two ranges. Only a few of them are needed for PSN and FFXIV, but I wasn't in the mood for looking up what each port did. Hardwiring is still your best bet, though.
The PS3 is capped at 54mb per second wirelessly due to the 802.11g spectrum. A cat-5e ethernet cord is 100mb. The third variable is the how much data is able to be downloaded and controlled by your ISP. The patch server should have priority for data so that's good news, but again, they might cap out the speed too opting for many transfer at one time without nerfing the quality of download speeds.
It's always best to use Cat 5e or higher wiring. Wireless has too many problems to be reliable. The 802.11g network uses 2.4ghz frequencies which almost every electronic devices uses including our cell phones and bluetooth. There is interference from this and every little bit hurts.
If anyone is interested, I have a comparison for the PS3 vs PS4.
Ethernet 10gb or 1GB(roughly) Edited, Aug 14th 2013 2:47pm by ShadowedgeFFXI