The update requires me to nudge my scrollwheel 10 times to move across one hotbar slot. This bug is not present in any other released version of Minecraft.
MC-131563
Mouse scrolls too slow through hotbar (using actual mouse)
Resolved
Duplicate
0
TeamCobra
(Unassigned)
Unconfirmed
Minecraft 1.13-pre2
Retrieved
Scrolling speed was recently added as an option. You can change that to increase/decrease the distance to scroll one slot.