diennk

By default our browsers have scroll not smooth. It seem lag when mouse wheel.
A plugin was make browser’s scroll smoother.
No settings required. Just install plugin and active it then see your scroll bar scroll smoother

Smooth Scroll

By default our browsers have scroll not smooth. It seem lag when mouse wheel. A plugin was make browser's scroll smoother.

kubiq

Replace basic website scrolling “effect” with nice smooth scroll using mousewheel, touchpad or keyboard arrows
You can play with settings and test it here: 
<a href="https://demo.tastewp.com/mousewheel-smooth-scroll" rel="nofollow ugc">https://demo.tastewp.com/mousewheel-smooth-scroll</a>

MouseWheel Smooth Scroll

Smooth scrolling experience, with mousewheel, touchpad or keyboard

Smooth Scroll vs MouseWheel Smooth Scroll