Less is more 5. Make it programmable 6. Make it personal 7. RESTful 8. Discoverability 9. Clean 10. Playful 10 Golden Principles for Building Successful Web Applications by Fred Wilson
number of searches, reflects more satisfied users. Our experiments demonstrate that slowing down the search results page by 100 to 400 milliseconds has a measurable impact on the number of searches per user of -0.2% to -0.6% (averaged over four or six weeks depending on the experiment). That's 0.2% to 0.6% fewer searches for changes under half a second! While these numbers may seem small, a daily impact of 0.5% is of real consequence at the scale of Google web search.” Google Search: