Thank you for putting an eye on this.
Here's the link: https://transfer-vinci-energies.netexplorer.pro/dl/K66WfdTdGYaxgsddMaIqMgq7O9NJub
This 15 seconds sequence example produces:
v6.10: h264, 1080p, default quality settings, 60fps = 20Mb
v6.10: h264, 1440p, default quality settings, 60fps = 31Mb
v11.71: h264, 1080p, default quality settings, 60fps = 88Mb
v11.71: h264, 1440p, default quality settings, 60fps = 94Mb
It is not hardware related, tests were done in the same PC. Also tested both versions in my work PC, got the same differences between versions.
Exporting in h265, I got equal values between both versions, so it happens only with h264 exports.
Thanks.