Performance question on 2 iRules

There are plenty of examples from F5 about switch being faster than if/else. Here are a couple:

 

 

https://devcentral.f5.com/Tutorials/TechTips/tabid/63/articleType/ArticleView/articleId/108/iRules-Optimization-101--01--if-elseif-and-switch.aspx

 

An even more efficient manner of dealing with multiple if statements is to get rid of them all together! No, I don't mean remove the logic from your rule, I just mean use switch instead. The switch command is more efficient, in general, than using a string of if or even if/elseif statements. It's also flexible in the matching that you can do.

 

 

https://devcentral.f5.com/Tutorials/TechTips/tabid/63/articleType/ArticleView/articleId/1086424/Comparing-iRule-Control-Statements.aspx

 

Always think: "switch", "data group", and then "if/elseif" in that order.

 

If you think in this order, then in most cases you will be better off.

 

Use switch for < 100 comparisons.

 

Switches are fastest for fewer than 100 comparisons but if you are making changes to the list frequently, then a data group might be more manageable.

 

 

 

 

In general, I don't think twice before using a switch if it's more than just an if/else.