By default the scroll speed of Manjaro is quite slow. We can easily increase this with the application imwheel.
For my case I felt Chrome was scrolling way too slow. Fix this I did the following:
# First install imwheel
pacman -S imwheel
# Create profile:
vi ~/.imwheelrc
# Add contents:
".*"
None, Up, Up, 3
None, Down, Down, 3
# Run imwheel
imwheel