Please note - Most Linux laptops are being throttled due to low cTDP bug. It impacts almost all new laptops, including Lenovo.

You can read more about this -> https://forums.lenovo.com/t5/Other-Linux-Discussions/X1C6-T4...

If you are planning to buy Lenovo, go for higher end (T/P series models) as Lenovo will provide Bios updates to resolve this issue.