performance of iRules

Yann,

 

Yes, There are things to avoid with irules when considering performance. Regex, Logging, and Loops to name a few. Check out the "iRules Optimization 101" series on dev central or take the F5 iRules class for more info.

 

 

You can test the performance cost of a iRule with the "Timing on" command to collect CPU cycle info.

 

 

I suggest, if you haven't done so already download the LTM VE for free. And lab out some of the rules you are looking at.