RE:why ILE is faster than OPM

> why ILE is faster than OPM? or point me links in IBM where I can read..

Static linkage, I should think.

Whenever an OPM program has to call something outside itself, it has to do
a dynamically-linked call, because OPM has no concept of a linkage editor.
ILE, on the other hand, has the ability to link multiple
separately-compiled modules together statically (the CRTPGM command
invokes a linkage editor), and much of its runtime routines appear to be
linked together in service programs, which (I'm guessing) become static
calls once the service program has been resolved and pulled into the
activation group, whereas the OPM runtime routines tend to be lots of
separate dynamic calls.

--
JHHL