Definitely used have issues with this in Kunark outdoor zones, pulling in Dreadlands, BW, and Skyfire in particular. You would just build up a certain separation and they'd stop following. It didn't have to be THAT large a gap either. I mean mobs would still be on the edge of your visual radius and they'd stop. They'd still be aggro on you though and when you got back within a certain range they'd go after you again.
But yeah, very anecdotal. Not really something one should even spend time trying to replicate. It was more just a little annoyance than anything else.
Yeah, I think some NPC's were easier to lose than others, but that might have simply been due to run speed. I remember wurms being the worst in this regard (being the easiest to lose) and they do move slower than most other NPC's yah?
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