I am not sure what can be done to make it faster, but in regards to ideas to make it look better, you should go through and clean up the legend and also the fields of the popup windows. For example, if you open the legend it displays "forsell", "FOR RENT PLOTS", and "oneplot". A good idea would be to clean those up so they are consistent and also make sense. For Sell, For Rent and One Plot would be better in my mind. "Roads_ziped" should just be "Roads". The MUSCAT_MIK feature seems to be one large file, if you click on it in the map it selects everything and shows one popup no matter what you click on. Is it supposed to be that way?
Hope the suggestions help!