1. Organize Feeds by Priority
Google Reader allows you to easily organize feeds by topic, but organizing them by priority is also very necessary. This way, when you're busy, you can clearly know which ones must be read and which ones can be temporarily skipped, improving efficiency and saving time.
2. Use Keyboard Shortcuts
Google Reader provides a large number of keyboard shortcuts for easy operation, using them can save a lot of time.
Here are some common shortcuts:
j/k: Move up/down
o: Open/close article
s: Star
m: Mark as read/unread
t: Add a tag to the article
Official Google Shortcut List
3. Bundle Some Similar Feeds