[FIXED] What is P99 latency?

Issue

What does P99 latency represent? I keep hearing about this in discussions about an application's performance but couldn't find a resource online that would talk about this.

Solution

It's 99th percentile. It means that 99% of the requests should be faster than given latency. In other words only 1% of the requests are allowed to be slower.

Answered By - Tomasz Nurkiewicz

Answer Checked By - Mary Flores (PHPFixing Volunteer)