The issues that some PS3 users are seeing doesn't appear to be an issue that can be solved on the client end. I've done some testing on the network infrastructure that Square is using and it does appear that some users are being routed though overloaded nodes and bottlenecked fiber lines. This is part of the problem. The PS3 also has to route though another hop (the PS Servers) to get to the end client. Adding that extra hop can and will increase latency on an already overtaxed network making the latency issues much more apparent on the PS3. In my mind, the issue with the PS3 clients is one of two things (or a combination of the two):
1.) Network latency on the host end. As PS3's have to route through already burdened racks and nodes combined with the extra hop that the PS3 has to pass through is adding a crippling amount of packet loss and MD5 errors. This cannot be solved on the client end. Nothing anyone does either with their network will correct the issue. You may be successful with a VPN, but only for the fact you are tricking the host into changing your route path to hit less taxed nodes. This is a gamble and even with a VPN, your route path may not change.
2.) A hardware component defect. Though this is rare, This could be a cause of what PS3 users are seeing. It could be a faulty NIC that can be dropping packets due to bad translation and/or unable to translate the amount of data it receives. It could also be a faulty GPU/CPU/Fan. The GPU could be heating up to the point that it has a hard time rendering the display correctly. The same can apply for the CPU. The fan on the unit may not be able to properly cool the circuits causing rendering issues or dust build up in the system itself creating issues. Reapplying thermal paste to the CPU/GPU may increase the performance as well as blowing out the PS3 for any dust. Replacing the fan may also give some results. If the NIC is faulty, there isn't a whole lot one can do about that expect purchase a new PS3 (to modify would cost more money than a new unit).
The issue is more than likely the the first, but mileage varies for each user and some could be affected by second as well.
Hope this helps!

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