Speed and delivery.
PAGE LOAD TIME
How long a page takes to become usable.
CACHING
Storing generated content to avoid regenerating it.
BROWSER CACHING
Instructing the visitor's browser to keep files rather than requesting them again.
OBJECT CACHING
Storing database query results.
CDN
Serving files from servers closer to the visitor.
COMPRESSION
Reducing file size in transfer.
MINIFICATION
Removing unnecessary characters from code files.
LAZY LOADING
Deferring loading of images until they are needed.
TIME TO FIRST BYTE
How long the server takes to begin responding.
RENDER BLOCKING
Resources preventing a page displaying until they load.
CORE WEB VITALS
Published measurements of loading, interactivity and visual stability.
WHAT AFFECTS SPEED MOST
Images and caching, in most cases.
