How to improve Magento performance, to get fastest eCommerce site

Recently a client asked us how to make his Magento based eCommerce site with best performance, here comes our advices:

1) Enable opcode cache, for example APC or Zend Guard.

2) Enable cache and compress for static files, e.g.  css,  image,  js,  swf

3) Magento needs much more memory than any other PHP scripts, so add more memory if possible.

4) If there is more than one server, we can move static files to another one, including files under /js, /media, /skin

5) The cache can move to memcache, of course,  need a server to provide memcached service.

6)  MySQL can use multiple servers too, set one for read-write mode, set others for read mode. In this case , MySQL read processes can split into several servers.

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Option 1 can increase load speed of php.

Option 2 can reduce the bandwidth.

Option 3 need add memory,

Option 4 and 5 need to add more servers. This way need more hardware resource for Magento.