Your Joomla website needs to be optimized. Creating a site is not the only thing you should do for the augmentation of your business; you must try to make it all ready for the visitors. And visitors like to visit sites those are fast, relevant, short but informative. So your goal should be making your Joomla website as good as your viewers want it to be.
How your viewers will feel if they find that the site they are visiting takes excessive time for loading, the pages are full of irrelevant database queries and the script size is also huge?