How to set the mouse wheel scrolling speed in IntelliJ?

To get a precise scroll (very useful when comparing files), you can use Smooth Scroller plugin: https://plugins.jetbrains.com/plugin/8246-smooth-scroller

To scroll in larger steps, use Fast-Scrolling plugin: https://plugins.jetbrains.com/plugin/7573-fast-scrolling

You can use both plugins together, to make mouse scroll smooth and precise by default, whereas scrolling with CTRL key, makes it scroll faster.

I found it. It’s called idea.inertial.smooth.scrolling.unit.increment

You can find the option in the Registry (Help / Find action / type Registry)

There is no option for this feature

Just in case any windows 10 users stumble upon here.

Settings -> Mouse -> Choose how many lines to scroll each time

Set to 3.