

Geostationary satelites at 38000±2000km distance take around 125ms up and the same back down for about 250ms for you to reach a server, maybe you were thinking of that. My uncle has that on his farm in Australia. It’s bad, you can’t have a good IP based phone call because the delay is too long, people keep starting to talk at the same time.
Starlink flies in low earth orbit 450 - 500 km, so maybe up to 1500 km distance from you if its at the edge of reachability, for a worst case. That’s 5 ms, or 10 ms from you to the server. At those low distances the buffering overhead of their system will dominate like with Wifi. I don’t know how it works for Starlink specifically.
I think the real killer issue for starlink and realtime tasks is the constantly changing latency, and the handoff between satellites.







The comparison to subsea cables can’t be made yet, because Starlink doesn’t work that way yet. You are routed up to a reachable satellite maybe at most one or two hops over the inter satellite laser links to other satellites (but it’s hard to confirm anything concrete), and then quickly back down to the next reachable ground station. From there it’s fiberoptics.