Nah, you give the Dev's Way too much credit. Its bad Coding.
Do you like recall to server lines and rail across it? lol. I never payed attention, but I will check now to see when it freezes and note if any were within the same server area. I typically bounce all over the damn place too, facet to facet, etc... I haven't had too much problem once I put in an added wait after my x/y change position. I also haven't played UO in 2 months. I will again soon
I am making the last round of changes in my dissertation be for I submit it tonight. If things go well, I'll be playing some more UO tomorrow