I'm pretty close to positive that you're wrong about the freezing issue. My friends were on beta far before anyone knew that it'd work with the proxy and were having the same issues.
It's less about a lot of people on the servers causing actual lag and more with the program on the PS3 not being able to handle lag or very quick disconnects.
I'm pretty much latency/lag free until it freezes up (and that usually takes about 30 minutes as well).
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