Hi,
Yes, Google always scores with 20-40 points mobile performance for 99% of websites built with WordPress. To get more points you need to have a really light page. For example remove all sliders, carousels and leave a few banners and products only. Then you will get a high result. But usually, our theme works very fast on mobile devices and don’t have any problems with performance.
Check our light demo for example https://woodmart.xtemos.com/demo-light/?opt=light
Regards