My Forum is terribly slow compared to vbulletin

[rafass]

Quite old - you should upgrade to 5.5. or 5.6

This upgrade improve the performance / is recommended?

 

[Moscato]

This upgrade improve the performance / is recommended?

As nobody responded, I might as well.

Newer php may or may not be faster, but it is more stable, with more bug fixes and compatibility.

I run 5.6.