A Jiffy Is About 10 Milliseconds in Computing

An operating system relies on a steady internal heartbeat, known as the system timer interrupt, to manage everything it does. The duration between each of these "ticks" is what programmers call a jiffy. This tiny slice of time is the fundamental unit for the system's scheduler, allowing it to juggle multiple applications through a process called time-slicing. While the exact length is configurable in a system's kernel, it is commonly set between 1 and 10 milliseconds. This frequency is a delicate balance: fast enough to create the illusion of smooth multitasking for the user, but not so fast that the processor wastes too much time just handling the interrupt itself.

The term's ambiguity comes from its informal origins as slang for "an instant," which led to different scientific fields