In reply to donnacha.

Also of note for those who do want deal with best performance be it Wordpress or Jooml'r.

When you look at the costs of many VPS's or shared hostings along with VPS etc. you rapidly will see that dedicated hosting is actually a better choice. In respect to resource usage slap as much as possible into SSD drive(s) on the server.

Not only does this vastly increase "Peppy" nature since files come off a solid state device .vs a mechanical drive but by increasing that throughput results in your resources being released faster.