I'm a longtime Linux user and every article I've seen decries Linux's extremely poor power management especially on Laptops.
Can you go into more detail on your setup?
Did you install any custom or non-standard kernels modules?
Any specific config tweaks?
What version of W10?
No special tweaks, or kernel modules - just 'systemctl enable powertop'.
Windows 10 was the ultimate version that was upgraded from the Insider project.
Not only is the RAM usage less (right now, ksysguard is showing 2.2Gb / 7.7Gb RAM used), but the disk activity is less. Performance seems about on par as to loading programs (Chrome / Thunderbird etc). I even get the bonus of being able to use luks for a fully encrypted root partition as well.