I did some more testing.
260 x 100 = 26.000 tiles took ca. 5 min to generate and I could start the game. VRAM consumption was at the limit of 4 GB.
280 x 100 = 28.000 tiles took ca. 6-7 min to generate the map and when the game started to transfer data to VRAM, the game exited when reaching the 4 GB VRAM usage ... (crash to desktop)
180 x 90 = 16.200 tiles uses already 3,85 GB of VRAM ... (high settings)
As a reference : the unchanged huge map size has 106 x 66 = 6.996 tiles and uses 3,33 GB VRAM.
Civ 4 and Civ 5 on Giant Maps became unstable around industrialisation, so starting Civ 6 already near the VRAM limit of 4 GB is not a good idea.
My suggestion would be to go to the graphics menu and change settings to optimize for memory usage if you are testing for extreme map sizes. Also if you don't have a ton of system RAM you will probably also encounter issues, as one of those two is the bottleneck for map creation.
Can you try 230x115 ? (26,450 tiles)
Still good, but a bit higher and it crashes for me while I still got some vram available (and going above shouldn't make the game crash anyway, only the FPS would suffer)
Thanks, looks like a hard limit as for Civ5, but this time it's so high that almost no one will reach it (ok, please, don't quote me in 4 years about that...)230 x 115 and 230 x 116 works.
230 x 118 and 230 x 120 crashes the game.
Memory usage with minimum settings is now negligible, but minimum graphics look worse than Civ 4 ...
I did some tests with minimum settings. VRAM usage now is only 1-2 GB for a huge map when starting a new game. This works with a custom map of 260 x 100 = 26.000 tiles (map not revealed). When I try to start a game with 280 x 100 = 28.000 tiles, the game still crashes, so there must be some hidden limit to map size besides the VRAM consumption.
Could you look at the game EXE directory and find one of the dumps it created with the 200x135 map and upload it? I'm curious if it is crashing in the gamecoreDLL (which would be a good sign).I just started 200 x 130 with minimum settings. RAM usage 1,9 GB, VRAM 1,4 GB ... my system has 12 GB RAM and 3,5-4 GB VRAM, so it is not the system ... the magic number of tiles is around 27.000 tiles since 200 x 135 crashes while 200 x 130 works.
edit: got it working! yay