Well, do some math and be sure of that, your webserver can serve upto 60,000 people, but since it's PHP based unless you edit the PHP .ini file your restricted to just 600 users. So if your website maxes at 600 users, what is the total size of your site on load, multiply that amount by 600, is your internet capable of serving this out? Do 600 people even visit in the course of an entire day? Do more than 3 people ever concurrently use your site?

If it is not, one of the suggested reductions is to remove png,jpg,bmp images, especially backgrounds, and favor svg for icons and other graphical elements. You can likely get a site that is very efficient to serve out and can be easily served even on a gimpy home connection.