 <p>Recommend two books to you:</p> <p><a href="http://rads.stackoverflow.com/amzn/click/0596529309" rel="nofollow noreferrer">http://www.amazon.com/High-Performance-Web-Sites-Essential/dp/0596529309</a></p> <p><img src="https://i.stack.imgur.com/TeuDE.jpg" alt="hi"></p> <p><a href="http://shop.oreilly.com/product/9780596522315.do" rel="nofollow noreferrer">http://shop.oreilly.com/product/9780596522315.do</a></p> <p><img src="https://i.stack.imgur.com/I6mkU.gif" alt="enter image description here"></p>