← Sensors & Location
Compute Pressure
Probing…Compute Pressure is a web platform capability in the Sensors & Location category. Observe CPU pressure to adapt workloads. Supported in Chromium 125+; not available in Firefox and Safari. Requires a secure context (HTTPS or localhost).
Secure context
Try it
Loading demo…
Code
const observer = new PressureObserver(records => {
const latest = records.at(-1)
console.log(latest.state) // 'nominal' | 'fair' | 'serious' | 'critical'
})
await observer.observe('cpu', { sampleInterval: 1000 })
// later: observer.disconnect()Browser support
Chromium
125
Firefox
No
Safari
No
Frequently asked questions
Which browsers support Compute Pressure?
Supported in Chromium 125+; not available in Firefox and Safari.
Does Compute Pressure require HTTPS?
Yes. Compute Pressure needs a secure context, so it only works over HTTPS (or on localhost during development).
What is Compute Pressure used for?
Observe CPU pressure to adapt workloads.
Can I try Compute Pressure in my browser?
Yes. shwcs.net runs a live Compute Pressure demo that probes your current browser and lets you try the API. Everything runs locally — nothing is sent anywhere.