How to Fix Slow WiFi on a Windows 11 Laptop on Battery: Power Plan, WiFi Adapter, and Sleep Settings That Throttle Your Connection

Plug your Windows 11 laptop in and your WiFi feels fast. Pull the cable and speeds drop noticeably — sometimes by 30 to 60 percent. This is not a coincidence or a bad router. Windows is deliberately throttling your wireless adapter to save battery life, and it does so silently through three separate layers of power management settings. Run a speed test while plugged in and again while on battery to confirm the gap, then work through the fixes below to get full wireless performance back.

Why Windows 11 Throttles WiFi on Battery

Windows 11 applies power-saving behavior to your wireless adapter through three overlapping mechanisms:

• Power plan setting: The active power plan (Balanced, Power Saver, or High Performance) sets a baseline WiFi power saving mode — Medium or Maximum savings on battery by default.
• Device Manager power management: Windows can cut power to the adapter entirely to save battery, interrupting the connection and forcing a reconnect when the device wakes.
• Adapter-level firmware settings: Intel, Realtek, and MediaTek adapters each have their own advanced power-saving options exposed in Device Manager properties — separate from the OS-level controls.

All three need to be addressed. Fixing just one will leave the others still throttling performance.

Fix 1: Set Wireless Adapter Power Saving to Maximum Performance

This is the most impactful single change. Windows hides this setting inside the classic Control Panel rather than the modern Settings app:

1. Press Win + R, type powercfg.cpl, and press Enter to open Power Options.
2. Click Change plan settings next to your active plan (usually Balanced).
3. Click Change advanced power settings.
4. Scroll down and expand Wireless Adapter Settings → Power Saving Mode.
5. Set On battery to Maximum Performance. Also set Plugged in to Maximum Performance while you are here.
6. Click OK and close the window.

The four available modes are: Maximum Performance, Low Power Saving, Medium Power Saving, and Maximum Power Saving. The default “On battery” value on Balanced is Medium Power Saving — which reduces the radio’s transmit rate and polling frequency to extend battery life. Setting it to Maximum Performance restores full radio activity. The real-world battery impact of this change is typically 2–9% less runtime, depending on how much you use WiFi.

Note: If you do not see Wireless Adapter Settings in the list, your system may be using Modern Standby (S0ix) rather than the classic S3 sleep state. See Fix 4 below.

Fix 2: Disable Power Management in Device Manager

Windows can also power down your WiFi adapter entirely when it decides the adapter is idle. This causes sudden disconnects and forces a reconnect cycle that looks like a slow connection but is actually a full drop-and-rejoin:

1. Right-click the Start button and select Device Manager.
2. Expand Network adapters and locate your wireless adapter (for example, “Intel Wi-Fi 6E AX211” or “Realtek RTL8852BE WiFi 6 802.11ax”).
3. Right-click the adapter and select Properties.
4. Click the Power Management tab.
5. Uncheck “Allow the computer to turn off this device to save power”.
6. Click OK.

This prevents Windows from cutting power to the adapter during idle periods. On its own this does not restore full transmit speeds, but it eliminates the connection drops and slow reconnects that often accompany battery-related throttling.

Fix 3: Disable Adapter-Level Power Saving in Advanced Properties

Your WiFi adapter’s driver exposes additional power-saving controls that are separate from the Windows power plan. These vary by manufacturer but are all accessible from the same place:

1. In Device Manager, right-click your wireless adapter and select Properties.
2. Click the Advanced tab. You will see a list of adapter-specific properties.

Look for the following settings and change them as described:

• 802.11 Power Saving Mode (Intel adapters): Set to Off or Disabled.
• MIMO Power Save Mode (Intel AX-series adapters): Change from Auto SMPS to No SMPS. Auto SMPS reduces the number of active antenna chains when idle to cut power draw — this directly reduces throughput.
• Power Saving Mode (Realtek and MediaTek adapters): Set to Disabled or Maximum Performance.
• Idle Power Management or Selective Suspend (if present): Set to Disabled.

Click OK after making changes. The adapter will briefly disconnect and reconnect as it reloads the driver with the new settings.

Fix 4: Switch the Active Power Plan

If you are on the Power Saver plan, WiFi throttling is even more aggressive — and CPU throttling will also slow down the overall system, making network operations feel worse than the WiFi alone accounts for. Switch to Balanced or High Performance:

1. Open powercfg.cpl via Win + R.
2. Select Balanced (recommended) or High Performance.
3. If you do not see High Performance, click “Show additional plans” to reveal it.

High Performance keeps the CPU and adapter at full speed at all times and will reduce battery life more meaningfully. Balanced with Wireless Adapter Settings set to Maximum Performance (Fix 1) is the better trade-off for most users — you get full WiFi speed while the CPU still scales back during non-demanding tasks.

Fix 5: Update Your WiFi Driver

Outdated drivers can make power management bugs worse. Intel releases regular updates for its AX-series adapters that fix power state transitions and improve stability on Modern Standby systems:

1. In Device Manager, right-click your wireless adapter and select Update driver → Search automatically for drivers.
2. Alternatively, visit your laptop manufacturer’s support page or Intel’s Driver & Support Assistant for the latest adapter-specific driver.

If a recent driver update made things worse, use Update driver → Browse my computer → Let me pick from a list to roll back to a previous version.

Verify the Fix

After applying all changes, run a speed test while on battery and compare it to your plugged-in baseline. Speeds should be within 5–10% of each other. If the gap is still large, check whether your router’s band steering is shifting the laptop to 2.4 GHz when signal weakens — see our guide on 2.4 GHz vs 5 GHz vs 6 GHz WiFi for how to force your laptop to the 5 GHz band. If you are working from home and call quality is the priority, our guide on best routers for working from home covers the router settings that help most with video calls and VPN traffic.