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Enderal is based on the old (!) Skyrim engine. This is designed for 60 fps and 60hz in Full HD.
Higher fps (from around 80) can cause errors in some locations and lead to permeable textures, for example.
Therefore we do not recommend and do not support it.
The fps are limited by default to (almost) 60 with activated ENBoost (in the enblocal.ini).
Enderal is an RPG, not a shooter. Therefore, 60 fps is absolutely sufficient for a good gaming experience.
The optional optimizations primarily serve to improve stability but experience has shown that this is independent of the possible performance of your system.
You are of course welcome to experiment with the graphics settings and the optimizations. But there is no such thing as an optimal setting that applies to everyone.