Consequences of poor site performance
If your site has poor performance, your visitors or your analytics will let you know. Without an indication that a web page is loading within a few seconds, a visitor will "bounce" to a different page. Visitors may message you directly, or complain about slow response times on social media.
The following image, taken from , shows how quickly the bounce rate climbs as page load times increase.
Page bounce probabilities
The conclusion is clear: if you want to keep visitors engaged, you need to keep your load times to a minimum.