This counts for a lot, people dont realise mapping can seriously affect how a turbo spools etc even if all else is equal.
Although it drives nice and dead economical driving sensibly (yes, an economical 450bhp car with 6x 740cc injectors, lol), my car came back with full boost at least 500rpm higher and boost in general starting maybe even higher than that after it was mapped compared to how it was before on the crappy SAFC2 setup, despite being about twice as powerful lol.
I was confused when the mapper commented it was 'quite laggy' as when I gave it to them I could see boost under 3000rpm! Couldn't after though, thankfully it was so fucking quick from then on in I didnt care enough to get it changed.