Do the enhancements affect the performance even if they are blank?

I means that SAP has preserved so many user exit for developer to do enhancement, is it has effect to system performance even though we didn't implement them? because the system must always check if there is implemented enhancements.
Moderator Message: Moved from ABAP General as the Performance Experts are here.
Edited by: kishan P on Aug 31, 2010 12:18 PM

No, enhancements doesn't affect the performance at all.
It's true that there are a huge amount of enhancements, but to check every one for your current process doesn't affect.  You don't do  a lot of access to database in order to check every enhancement.

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