You really should ask on c.l.a. . There are professional Ada users 
spending lots of time doing profiling and testing various options. Why 
not asking them ?

I did a few tests today on this interesting topic, with GNAT GPL 2016.
Just grabbing a part of my toolbox used in the real world, the zip-ada 
compression with -ep2 option is 50% slower without -gnatp that with it 
(all other options being the same) on a Xeon PC.
Another program, an intensive-FPU number-crunching software with large 
arrays, used at work, is actually 2% *faster* without -gnatp than with 
it, on the Xeon machine; and arond 1% *faster* on a laptop (CPU unknown).
So with some testing I get a [-50% , +2%] range depending on the 
applications...


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