Google Instant is a new search feature that shows results while you type.They are pushing the limits of their technology and infrastructure to help you get better search results, faster.
The key technical insight is that people type slowly, but read quickly, according to Google typically taking 300 milliseconds between keystrokes, but only 30 milliseconds (a 10th of the time!) to glance at another part of the page.
Faster Searches: By predicting your search and showing results before you finish typing, Google Instant can save 2-5 seconds per search.
Smarter Predictions: Even when you don’t know exactly what you’re looking for, predictions help guide your search. The top prediction is shown in grey text directly in the search box, so you can stop typing as soon as you see what you need.
Instant Results: Start typing and results appear right before your eyes. Until now, you had to type a full search term, hit return, and hope for the right results. Now results appear instantly as you type, helping you see where you’re headed, every step of the way.