suddenly there's like 2-5 second delay when trying to open the save menu, and I'm randomly getting delay in other aspects of the game too, is there a way for me to uninstall and reinstall the game without losing my save?
Are you on android or PC? PC should be fine for uninstalling, but you can copy the save folder located in the game folder's local directory if you want.
For Android you can copy your save folder from com.androidterrene_0_0_9 folder, located in your storage and place it wherever on your device.
There's also an option to just jump to Act 2 when creating a new game if you want.