This zone is my bane. I'm running EQ on linux (plain install, no launchers, custom UIs etc) using a what I imagine is a much different setup then others here, however I get exactly the same problem that others have detailed in this thread. The idea my router knows when I zone into TT and lags only then is just absurd. Internet speed below.
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Getting into TT is quite the ordeal. I zone in, wait for the lag to hit a few seconds later, then do "/who wizard all" for a few minutes. If I continue to get results back immediately I know I'm good and can run to seb, if it lags or simply doesn't return results at all I know I need to /q out and try again. Often I'll be retrying 10+ times before I get it to work or just give up.
Doing a "/who wizard" always returns immediately even when desynced.