I think you do not understand. All of Bethesdas games are frame rate physics locked because of netinense code that has never been replaced. It could be replaced yes but it has not been overhauled as it is a core system that many other systems are bolted onto
Netimense > Gamebryo > Geck > Creation kit same DNA .
There's a reason all the 3d files are .nif Netimense Format