Web developers, especially PHP developers, have it easy. We write applications that take a web request, do some work, and return some sort of response. When we do our job properly, we return that request as fast as possible. According to HubSpot, the first four seconds of a page load are the most important. After that, conversion rates start to drop off rapidly. Older stats show that users would begin to leave at the three-second mark. by Chris Tankersley