So this is exactly whats happening to me as well!! Did you find a work around,? or will I need to go back to the lower internet/modem?
Firestorm 6.3.2 (58052) Sep 27 2019 22:41:52 (64bit) (Firestorm-Releasex64) with Havok support
You are at 189.3, 240.8, 39.2 in Caldbeck located at sim10396.agni.lindenlab.com (18.104.22.168:12035)
(global coordinates 263,357.0, 257,777.0, 39.2)
Second Life Server 2020-02-05T22:16:31.536040