Keyboard shortcuts can save you a lot of time by navigating you quickly through your posts / feeds. The supported keyboard shortcuts are:

j / k	Read the next/previous displayed post
space / shift-space	Move the page down/up
n / p	Select the next/previous post without marking it as read or expanding it
o, enter	Expand or collapse the selected post
i or s	Mark selected post as interesting (love)
u	Mark selected post as uninteresting (hate)
m	Switches the read state of the selected post (read / unread)
v	Read original source of the selected post in a new window (visit link)
shift-a	Mark all displayed posts as read
1	Expand all displayed posts
2	Collapse all displayed posts
r	Refresh the unread counts in the folder tree
g then a	Go to "All posts"
g then s or i	Go to "Loved posts"
g then u	Go to "Ignored posts"
g then n	Go to "Unread posts"
g then r	Go to "Read posts"