Old Bob - Not sure, paragraph at the top here mentions a few techniques used. I think the frame rate was slightly higher than on say a 500 but then the ST had a quicker cpu anyway. I expect mostly it is running ST 68k code which some minor improvements as opposed to being re-written to use the custom chips. There are tons of ST ports for the Jag but most needed the Skunk board (flash cart but only takes a couple), now the SD cart has been released they are redoing some for that (further down first post), music is changed on some for example so not using ST noise
https://atariage.com/forums/topic/24...to-the-jaguar/
Bit off topic
Getting back on topic, there are some truly dreadful 3D games on the Jag which is probably what would happen if a VF port was tried on a 030 Amiga lol