Does USB selective suspend cause mouse stutter or input lag?

No, not while you are moving the mouse, and on a mouse whose maker has not opted in, not at all. Microsoft's HID selective suspend page says that "by default, USB selective suspend is disabled by Windows" for HID devices, which is what a USB mouse is, "to avoid resume latency". A mouse is only suspended if its maker opted in, and only after it has gone idle. So the Power Options switch that every tweak guide mentions is a fix for a device that drops out or will not wake. If your mouse never disconnects, leaving it on costs you nothing.

Why two answers circulate

Disabling it is real advice from a real manufacturer. Logitech's "Troubleshoot gaming mouse connection issues" tells you to set USB Selective Suspend to Disabled in Power Options, for wired and wireless mice alike. But the page is about connection issues, and it lists the step next to fresh batteries, another USB port, avoiding hubs and testing on another computer. It never mentions lag.

The latency version came later. Attack Shark's power plan article (January 2026) says "inactivity" can be "misidentified during the microscopic gaps between rapid mouse movements", producing "a latency spike of 2ms to 5ms". The figure is attributed to "common patterns from customer support and warranty handling". No test, no mouse, no method.

Then there is Microsoft's general USB selective suspend page, which says the feature "is enabled by default" and that Microsoft "strongly recommends not disabling" it. That sounds like a contradiction of the HID page. It is not: the power plan setting allows suspend across the USB stack, and the HID class keeps its own default of off.

What has to happen before a mouse is suspended

Every condition below has to be true, in this order, before a mouse sleeps:

1. The maker opted in. Microsoft lists two ways to enable selective suspend on a USB HID device: a Microsoft OS descriptor in the firmware, or a vendor INF that installs the HID_SelSus_Inst section. The default HID_Inst section "does not support selective suspend".
2. The device is idle. Client drivers send an idle request "whenever the device is idle", and the bus driver suspends the device only after it "determines that it's safe".
3. The device drops to a low-power state, D2 in Microsoft's example, while the rest of the PC keeps running.
4. It wakes on movement. An opted-in HID device must "wake from selective suspend on movement", "retain the first input", "maintain the wireless link" and "resume from selective suspend without any perceived delay by the user".

A mouse in a fight is sending a report every millisecond or faster, so it never reaches step 2. The only moment suspend could touch is the first movement after the mouse has sat still, and Microsoft requires that movement to arrive. The "gaps between rapid movements" in the Attack Shark story are exactly where a suspend cannot start.

Three settings called "USB power saving"

The Device Manager box is documented in Microsoft's support article 930312, written for Windows Vista, which ties it to the same power plan setting. Microsoft's driver documentation explains why the tab appears on some devices and not others: when a driver allows users to change its idle and wake settings, the framework provides a page that Device Manager displays, and it "enables these settings by default". If you clear it while the device is already in a low-power state, "the framework returns the device to its working state".

What a 2 to 5 ms spike would look like

A suspend gap at a high polling rate would not be subtle. Divide the gap by the report interval:

Forty reports missing in a row at 8000 Hz is the kind of hole a polling rate test shows plainly. If you have that, it is real, but the usual suspects are the radio and the CPU, both covered in our polling rate guide, not a power setting Windows already keeps off for your mouse.

When to turn it off

Logitech's path is Control Panel, Hardware and Sound, Power Options, Change plan settings, Change advanced power settings, USB settings, USB selective suspend setting, with both entries set to Disabled. The cost is power, not speed: Microsoft says a device that is never suspended "might prevent the USB host controller from disabling its transfer schedule", which can keep the processor out of deeper sleep states such as C3. On a laptop running on battery, that is a reason to leave it on.

Where this stops applying

Microsoft does not publish which mice opt in to HID selective suspend, and a maker's own driver can install an INF that turns it on, so a specific mouse may behave differently from the default. Even then, Microsoft requires that it wake on movement without perceived delay, and we have not measured one that fails. Everything here is USB on Windows: Bluetooth mice and other operating systems have their own power management. A USB hub, monitor hub or receiver dock adds another device that can be suspended, and Logitech's page also says to avoid hubs. And like the HPET tweak, this is a setting that circulates as a latency fix with no documented latency behind it.