For low-latency applications, and this can be anything from your computer's UI to a webserver, at around 80%, you start to see latency increase quickly. If it's

For low-latency applications, and this can be anything from your computer's UI to a webserver, at around 80%, you start to see latency increase quickly. If it's CPU-intensive on your computer, you can run the CPU hog at a lower priority. If it's a webserver, you're forced to trade off throughput and latency.