WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: How to speed up three years old site with Twenty Fifteen theme?, by HudsonValleyWebDesign There is a LOT of content loading on the home page. There are a lot of server requests. Page took 10.85s to load. http://www.wpbeginner.com/wordpress-performance-speed/ I suggest updating theme and optimizing everything. (and not DIY) Hire a professional for professional results. Reply To: How to speed up three years old site with Twenty Fifteen theme?