Windows Player framerate drops significantly when moving the mouse cursor with high polling rate

Note: this is a duplicate of the Editor ticket, but the user is raising that this is impacting the player as well and its a concern for them.
This is the slack thread where they are escalating this: https://unity.slack.com/archives/C0105CH72UV/p1781606011871939

The original ticket ([Internal link]) contains a comment with some Editor investigations that might also be valid for the Player.

Reproduction steps:
1. Open the attached project "IN-141292"
2. Connect a mouse which supports 1000 Hz polling rate or higher
3. Open scene "SampleScene"
4. Enter Play Mode
5. Move the mouse cursor in Play Mode view (make sure that the view is focused by left-clicking on the view)
6. Observe the result in the graph in the top right corner of the Game view

Actual result: The Editor experiences severe lag spikes and FPS drops when moving the mouse (e.g., from a stable 160+ FPS to alternating <10 FPS dips)
Expected result: The Editor maintains a stable framerate without lag spikes

Reproducible in: 6000.0.75f1, 6000.3.15f1, 6000.4.7f1, 6000.5.0b7, 6000.6.0a6

Reproducible on: Windows 11
Not reproducible on: macOS (M3)

Reproducible with devices:

• Logitech MX Master 3S for Business (polling rate up to 125 Hz)
• ATK F1 (polling rate up to 8000 Hz with 8000 Hz receiver)
• Corsair SABRE v2 PRO ULTRALIGHT WIRELESS (polling rate up to 8000 Hz)

Note:

• Also reproducible in Standalone Player
• The severity of the FPS drop scales directly with the mouse's polling rate. From a baseline of ~170 FPS, moving the mouse causes the following drops:

• 125 Hz: Drops to ~130 FPS
• 1000 Hz: Drops to ~120 FPS
• 2000 Hz: Drops to ~20 FPS
• 8000 Hz: Drops to ~10 FPS