CaptMike2022,
Did you patch the SH3.exe, with either a 4GB patch... or use Large Address Aware... with it.
Since this is... an older game, originally done up to run on not quite so... sofisticated machines as what's available now... the 4 gig patch & LAA, for short... tell newer computers to assign the .exe access to 4 gigs of RAM.
NOT that the game will utilize all that, just that it has an assigned privilege to do so.
Myself, with the, 2 SH3 set ups I run... I have them tagged by LAA, & they run fine with it.
1 of those is... Fifi's enhanced hardcore NYGM mix (the latest set up, at that...
) & the other is, OneAlex's... GWX v3: v1.52 mix set up.
M. M.