Reshared post from +Jerry Low
How much can a web host affect your site speed?
Answer: A lot.
More than a year ago I moved one of my sites to WP Engine – a powerful WordPress-only hosting; and the difference is shown in the graphic below (screen captured from Pingdom).
Site load time dropped from 900+ milliseconds to 500 milliseconds (almost 100% improvement) instantly after the switch.
If you are having hard time trying to improve your site load time, do not ruled out the fundamentals (eg. web hosting) too easily. Sometimes the easiest solution could be the best.
You can learn more about my WP Engine experience and reviews here: http://www.webhostingsecretrevealed.net/hosting-review/wp-engine/.