Photogrammetry for London is a lot of data, a lot more than NY.
I did some tests to figure out how much data there is
London City airport to Heathrow, 500ft altitude, Autopilot, noon, clear skies
Slowing down to give the game ample time to keep up (25% sim rate at max terrain with PG data)
8 test flights, identical conditions, checking data usage before and after the flight
No PG Data vs PG Data
Terrain 200 0.32 GiB 6.2 mbps / 4.38 GiB 85 mbps
Terrain 150 0.29 GiB 5.7 mbps / 3.49 GiB 68 mbps
Terrain 100 0.19 GiB 3.7 mbps / 2.73 GiB 53 mbps
Terrain 50 0.13 GiB 2.5 mbps / 1.58 GiB 31 mbps
Total data usage and converted to average mbps needed for a full speed 7 minute flight (In a Beechcraft Bonanza). The avg is just an avg though The PG area stops a ways before Heathrow. You likely need well over 100 mbps for the dense middle part over London at max terrain detail, regular flying speed.
I did the same tests for NY not all that long ago
NY LaGuardia to JFK straight line, low flight, 5 minute flight all PG data
Terrain 200 1.63 GiB 45 mbps
Terrain 150 1.42 GiB 39 mbps
Terrain 100 1.12 GiB 31 mbps
Without PG data (terrain at 200) it was 0.30 GiB 8.2 mbps
If I fly slow enough (30 knots, using quarter sim rate) it looks like this
If I fly at regular speed I have to pause for the game to catch up
Even though I have 100 mbps down, the server mostly stays under 40 mbps
And even fully resolved, it’s all still very crude source data
It needs some cleaning up, is this a large bird for example?
It’s amazing technology and I’m very grateful Asobo lets us sit at the forefront enjoying this new technology inside a game!