Vorticella is considered one of the fastest biological springs on the planet. It is a protozoa and only about 40 micrometers in size. It is able to contract it’s stalk in 1/60th of a second.
Blink and you’ll miss it.
Here 3 of them are entangled, triggering each other to all contract at the same time. The result is probably the fastest synchronized swimming event ever recorded 🙂