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ICR2 performance comparison (4-way test) on the Houston track on Pentium 4 3.2 GHz (software+V100) vs (Ryzen 2700X, software(vanilla dosbox-staging) + RReady):

https://youtu.be/c2lbAJs_urQ

Visually, the Reynard '99 carset runs the smoothest on Pentium 4 in software mode. Well at least it looks that way to me.

I'm going to attempt to go through each of tracks one by one to test compatibility, at the rate of one a day if I can, so here's the Texas Speedway:
https://youtu.be/3hHMx8GBKSw

Sanair 1985 (Quebec), now Rendition Ready:
https://youtu.be/CddhEFCHxdg

Long Beach '91 & '96:
https://youtu.be/Byk2H5zdUsE

Update: 01/07/2025
Cicero Oval, Chicago:
https://youtu.be/GXXYxYXdyh8

This is already Rendition Ready.

ICR2: Tamiami Park, Florida (Now Rendition Ready)
https://youtu.be/G0ovpI3XN7g