It seems indeed that in the latest versions of FPSC behaviour is similar though not exactly so by any means as V1.0 as the current source code is apparently an evolution of that source. Forgive me if I am mistaken there.
Anyway performance in the current FPSC it seem to me is very similar in its patterns to V1.0 and indeed outdoor levels seem to suffer most now from the lowest fps speeds.
Having said that most versions have varied quite a bit from one to the next and versions have always seemed to fluctuate quite a bit both with fps in outdoor and indoor levels, so that one never quite knows what you are going to get with each new version. Nice it might be if when a good one comes along especially if its reasonably balanced and stable if one could keep it, unfortunately progress never stops and with each update comes new challenges for both the developers and users alike.
Better is coming if you are lucky, So dont give up on outdoors levels - go for it....and make it Big and fill er up!
Nothing like a Challenge is there.