Media
Image and video files that are not resized and optimised for the web are the main cause of poor download performance.
Most images need to be inserted in two sizes for large screens and smaller mobile devices. They need to be properly resized and optimised and - where appropriate - lazy loaded.
Video files need to be as small as possible since their file size can be huge. Content width video players should have an HD and SD file to suit all devices.
Hosted video such as Vimeo and YouTube are best displayed in and - lazy loaded in - a lightbox. Otherwise they will adversely effect the page download time.
All video files should be either prevented from downloading until the visitor actually plays them or lazy loaded.
Most of the widgets available to EverWeb users are not suitable for responsive pages and will result in a poor page score.
Test pages using Google's PageSpeed Insights and aim for a score of over 90 for both desktop and mobile browsers.