Relic Castle

I've been experiencing lag on my Desktop computer when in battles. For some reason when I move to pick a move it lags just enough for it to be annoying(you can even see the Pokemon jumping slightly slower). None of these problems happen on my terrible laptop which can't even run the opening(Luka S.J's script) Smoothly but everything else in the game runs smooth. Is there anything I can do to fix this for my computer?

Edit(Changed the whole thing)