As you know on mobile or tablet, the performance become lower through the influence of heavy widgets like slider or animation. In case of you don’t need to keep some settings on mobile, you can disable that to improve performance.
Disable Mobile Animation
With small screen like mobile, animation is not a key role. Disable appear and slide animations in mobile to improve performance and get high speed.
Disable Mobile Slider
If there are many sliders in your site, they make your site performance lower because of many DOM structures in need to realize slider. So use scrollbar instead of carousel for only products and posts in mobile.