Movement in UO worked ok <i>most</i> of the time, and that was with clients on 56k modems and servers powered by hamster wheels.<p>&gt; it&#x27;s because they don&#x27;t care<p>That&#x27;d be nearly every company running an MMO then. You&#x27;re quite right in principle: speed hacks and teleportation should be extremely easy to find by doing basic sanity checks every now and then. But in practice these things go on for months and months.