I'm having the exact same issue. It's been so bad that I've had to abandon one of my worlds because the area I was building towards was so buggy I'd be getting stuck several times s a minute. And it wasn't a small area I could just easily avoid, either. It was a large section of my know map.
I emailed Notch with my level.dat, hopefully that helps him in some way.
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I emailed Notch with my level.dat, hopefully that helps him in some way.