On battery the laptop feels slow, on AC it's snappy. All default settings.
Battery saver or Energy saver mode deliberately throttles CPU, GPU and background activity to extend battery. Under 20 percent it usually kicks in automatically, often without the user noticing.
Try this first
- 1Check the current mode. Windows 11: Settings, System, Power & battery. 'Energy saver' is on or just off. Under the threshold it auto-enables.
- 2In Energy saver, set 'Turn on Energy Saver automatically when battery level is at' to e.g. 10 percent. For laptops on battery during the day, this avoids unwanted throttling.
- 3The Power mode menu (on battery itself) has three states: Best power efficiency, Balanced, Best performance. On battery Windows defaults to Best efficiency. On AC it can be Balanced or Best performance.
- 4On Mac: System Settings, Battery, Energy. 'Low Power Mode' is Only on Battery, Always or Never. For heavy work on the road set Never (costs battery), for travel set Only on Battery.
- 5For docked laptops: power profile on AC should be Best performance and screen brightness shouldn't auto-dim. 'Adaptive brightness' off, otherwise you get weird flicker while working.
- 6If you suspect throttling not from battery saver: 'powercfg /batteryreport' on Windows or HWiNFO shows per-component (CPU, GPU) whether a power or thermal limit is active.
When to bring us in
If on-AC performance stays poor, it's not power management anymore. Look at thermal throttling (separate entry), BIOS firmware or an undervolt setting.
See also
- My laptop is suddenly slowThree main suspects: a runaway background process, near-full disk, or a Windows update in progress.
- One specific application is slow for everyoneIf an app is slow for one person: local. For everyone at once: server side or vendor side.
- Opening files from the file server takes minutesOften the server itself is fine and the issue is network routing or stalling DNS resolution.
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