The "Optimize Website" feature that is commonly available on other cPanel based hosts is not available through our services as our webserver (Litespeed) automatically compresses/gzips content when possible. As a result it is not necessary to specifically enable that feature which is why the "Optimize Website" icon is not available in cPanel.
You can confirm gzip compression is enabled on your sites by viewing your request headers or ask our team through a support ticket to provide that information.