Compared Windows 10 vs Garuda Linux benchmarks using Geekbench 5. I get slightly better single-core performance in Linux (1332 vs 1212), slightly lower multi-core performance (5748 vs 5842), but HUGE boost in Linux with the Turbo button (6406 vs 6091).
It's the Turbo mode that's really surprising me.
Vulkan test varies a lot from run to run but gives about 61000 in Linux vs 58000 in Windows.
Windows has that pesky Defender (or a 3rd party Antimalware) installed and always running on the background. That alone slows down the OS, without a beefy enough hardware, you'll feel sluggish performance of using the PC.