What's the problem with stored procedures

I had an Informix employee (a fairly high level consultant type) tell me that I should not use stored procedures with Informix. He said that Informix did a very poor job of implementing stored procedures. He said that they were parsed at run-time, showed poor performance and in general caused problems within the engine. He said triggers were at least as bad. I was wondering if the user community has experienced problems with SPL and triggers in Informix. I am using 7.23.UC1 on AIX 4.1.5 for both OLTP and Data warehouse applications if this has any bearing. Thanks, Kirk