hi, welcome to the forum
there are some thing you can try:
- disable ENBoost and/or OneTweak (or enable them)
- make sure that no additional mods are installed or activated.
- check the
integrity of game files
- try restarting Steam and/or your PC.
- change settings in the Enderal Launcher, make sure the CPU and RAM usage are maxed out in the optimization tab.
- try redownloading the game
(the saves are well-meant, but we'd need the skse too

)
hope anything from that list already helps
