Originally shared by Kirill Grouchnikov
More gems from the same stream:
Sites with lots of rounded corners cause less damage than sites with sharp corners while traveling through the network. Be a good citizen.
Larger font sizes cost significantly more across the wire. For quick web font loading, keep them under 10pt.
The greater the number of requests you have, the higher the likelihood that one of them is going to be fast.
The speed that LCDs can display black is much slower than the speed that they can display white. Lighter web sites are inherently faster.
The more DOM elements you have on the page, the more they can work together to speed up page rendering and reflow.