When using Gmail, you usually need to head to your Gmail inbox in order to compose a new message, view your drafts, or visit another part of your inbox. Lifehack.org notes that you can actually bookmark these pages for quicker access.
I generally pin my Gmail inbox to the side of my tab bar, but that isn't ideal for everyone (and can lead to excessive email checking). If you prefer to keep your Gmail out of sight, Lifehack suggests setting bookmarks for commonly-used functions such as Compose, Drafts, Starred or any other function you use regularly.
It's an incredibly simple tip, but one that could be pretty helpful if you want to minimize both distractions and mouse clicks. You can always do it from your address bar if you want even more speed.