A/B Testing
A/B testing is a method of comparing two versions of a webpage to see which one performs better. For example, an e-commerce store might show 50% of its visitors a green "Buy Now" button (Version A) and the other 50% a blue button (Version B) to see which color leads to more sales. In the context of web performance, A/B testing is used to measure the impact of a faster website. By comparing a group of users with Speed Kit enabled against a control group without it, businesses can directly measure the uplift in key metrics like conversion rate. However, accurately A/B testing for speed introduces unique challenges, which are addressed by Speed Kit's Speed Impact Chart methodology.
Related web performance terms
- AVIF
AVIF (AV1 Image File Format) is a modern, next-generation image format that provides significantly better compression than older formats like JPEG and WebP.
- Abandonment Rate
Abandonment Rate is a metric that measures the percentage of users who start a specific process (like a checkout funnel or a sign-up form) but leave before completing it.
- Above the Fold
This is a term originally from newspaper design that now refers to the portion of a webpage that is visible to a user without having to scroll down. Content "above the fold" is the very first thing a user sees.
- Acceleration Rate
The acceleration rate is a key performance indicator specific to Speed Kit that measures the percentage of whitelisted page views that were successfully accelerated by the Service Worker.