Dear All
I was trying to look t what all steps one need to perform for better Drupal 7 performance. Came across http://friendlymachine.net/posts/2011/5-ways-to-improve-performance-in-drupal .

Almost 5 different ways are mentioned for performance improvement.

1. Druapl cache enabled, css/java script compress

2. Boost module

3. Memcached module + server

4. Varnish cache + server

My question is, can one use all 4 of them, or one need to choose only 1 of them. Or one need to choose few of them, can somebody guide me in this regard.

Thanks