Smooth scroll doesn't work on WSL2
### Expected behavior.

The smooth scroll feature, where PgUp/PgDown will shift the document line by line, doesn't work well on WSL2 and is pretty laggy.

How can I turn this off and go back to the old Vim scrolling where it just jumps one page?

### The reproduce ways from Vim starting.

A bug happened!

### Output of the `:SPDebugInfo!`

N/A