Arf, can you clarify a bit on your first sentence?
If one hits the "Esc" button located on the far, upper-left of their keyboard and click "Options > Video" and scroll down, the option of turning off water reflection and lowering view distance becomes available.
Deleting the weather cycle, as aforementioned by Kiki, can help so try moving the file out of the FeralHeart folder and see if the lag has diminished.
Me don't think you need to delete your objects so try what was mentioned above and if the lag still persists, give us another nudge.