Slow down my website

Very complete and nice looking plugin but I tried it many times and it just slow down my website A LOT, I can’t afford to use it if I sacrifice 10 sec… I just found another plugin which does exactly the same thing but doesnt slow down my website at all, wont give the name but just to tell that this is possible and that this is not just me. I am sure you could improve that point. Keep up the good work though.