Procedure
After reading a few posts and with some trial and error I've come up with a 'fix' for JC2 that works for me on Win 10.
1) download and install the Jun 2010 DirectX Redistributable pkg. It has slightly newer files than the ones installed with the game including x64 versions. It will not overwrite anything newer that's included with Win 10 - no worries.
2) run in compatibility mode for Win 7 ( I also tried Vista SP1 which was when this game was made but it makes no difference )
3) disable full screen optimizations - might not be needed but can't hurt
4) in game: settings, disable decals and bokeh (I'm using NVidia, Radeon not tested)
One other thing I did to make more use of my system is to add the Large Address Aware header to the JustCause2.exe . Download laa_2_0_4.zip from TECHPOWERUP website and unzip it to a folder. Copy the JustCause2.exe to this folder and run LargeAdressAware.exe, select the JustCause2.exe in this folder, tick the box to allow over 2GB and click save - that's it, its enabled. Now rename the original JustCause2.exe ( JustCause2.exe.old or whatever ) and move the enabled exe to your JC2 directory. The game doesn't hit the CPU cores too hard and I only see 1.2 GB of Video memory in use but I've seen up to 5GB of system RAM or so in use after playing for awhile. I've played over 40 hours without a crash, artifacting or other issue since using these settings.
System specs: i7 [email protected], 16GB 2133 RAM, GTX1070Ti (425.31 driver), SB AudigyFx, Samsung 860 EVO boot and game SSDs. Windows 10 x64 Pro
Bonus: the laa_2_0_4 can be used with other old 32bit games to allow them to use more memory too. Its not a hack so it doesnt affect multiplayer or online play. No more late game slow downs or crashes with large unit counts in RTSes or with expansion mods, etc. Have fun and game on ...
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=1951198991
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