Google PRINCIPLES OF MOBILE SITE DESIGN: DELIGHT USERS AND DRIVE CONVERSIONS - Manual (Page 8)

2. KEEP MENUS
SHORT AND SWEET
An extensive menu might work well for your desktop
site, but mobile users won’t have the patience
to scroll through a long list of options to try and find
what they want. Consider how you can present the
fewest menu items possible - for instance, a major
department store refined the product categories
on its mobile site, presenting study participants with
a shorter, more clearly-defined list than on desktop.
Example from Macy’s Mobile Site.
Key Takeaway
A shorter menu with distinct categories
is easier for mobile visitors to navigate.
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