OK dumb question- where do you enable display of Reputation Power?

[BirdOPrey5]

Keep in mind that these post elements add processing time to thread pages. For example, to get a user's age vBulletin needs to do some math on the user's birth date and the current date in order to get an age out of it. This calculation is done for each post being displayed on a thread page. The additional overhead is small but is there nonetheless. If you are wanting to optimize your forum for speed then you should disable these post elements.

I was just wondering if someone could confirm, I know it says it will need to calculate for each post if enabled but from my admittedly limited experience in php and vb it seemed like the variable for rep power is calculated anyway and the only option here is to display it or not, not actually do the calculation- unless it changes things elsewhere. I guess I could do the template edit to display the rep power and if it displays even with the setting off it's probably doing the calculation in the background regardless.