Nelio A/B Testing is a native WordPress plugin that makes it easy to run split tests in a WordPress installation.
One of our priorities is efficiency. The process of A/B testing a site is not necessarily at odds with performance. Nelio A/B Testing implements several mechanisms to reduce the impact of testing your sites, such as support for cache systems in WordPress and optional site-wide consistency.
If your websites have high-volume traffic, request a customized enterprise plan that fits your needs.