In my Xperia z3dual is slow only
1. - ,,loading´´ - compared with other skins or without any skin
2. first click on ,,new route´´ - here i think ist slow because of loading history

other things runs good...although not as without skin but..there are other good features in pongoskin witch i like

SO GUYS, patience, patience, nothing is good or perfect in first times (did you remember your first ver. of igo primo? - it was perfect as your desire? Nope, as time past you add some ux and other..

It is not a one-day affair