With mobile Internet usage expected to take over desktop usage, it’s never been as important as it is right now to fix your site speed. Internet users are less tolerant of slow websites than they’ve ever been, and the shift towards Internet-enabled mobile devices means that if you’re not fast, you’re not going to be seen.
Slow speed on a website hurts the customer patience, and in turn yor income. because they dont want to wait for the webpage to load. and wil go elsewhere in a heartbeat.
Searchengines also rank your site based on speed and various other terms.