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通过隐式的异步调度延迟减少浏览器的能耗
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Reduce your browser’s CPU usage and energy consumption with invisible async scheduling magic.
Web CPU Tamer adds subtle delays to JavaScript tasks running on websites. These delays are intelligently scheduled to give your browser time to "breathe" between heavy tasks — helping reduce CPU usage, heat generation, and power drain, especially on laptops and mobile devices.
Modern websites often run a lot of background JavaScript — animations, tracking, analytics, timers, and more. This can:
This script helps by slowing down how often JavaScript tasks are processed, without breaking the website’s functionality. It’s like giving your browser scheduled naps so it can stay cool and responsive.
The script modifies how these functions behave:
setTimeout(...)setInterval(...)requestAnimationFrame(...)Before each task runs, it introduces two small, invisible delays using:
queueMicrotask() to yield to the browser,MutationObserver trick to wait for a brief moment in the event loop.This helps smooth out bursts of activity, letting the browser:
It works quietly in the background — you won’t notice it, but your CPU will!
To avoid interfering with non-HTML files, this script automatically excludes URLs that end in:
.txt, .png, .jpg, .jpeg, .gif, .xml, .svg, .manifest, .log, .ini
This way, it won’t touch direct image or text file links.
Special handling is included for Brave + YouTube where extra CPU patches may be enforced.
Just click the “Install” button on GreasyFork and let Tampermonkey do the rest. The script will automatically run on all matching pages.
CY Fung
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This userscript is licensed under the MIT License.
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