Car feels slower after service ?????

Had the oil, oil filter, gearbox oil and violent changed and all is fine apart from it feels slower now. Can't put my finger on it but just seems slower as if it's heavier.

i need a remap as iv fitted akra and itg.......

But it was fine before the service, it goes well but just not aswell, could it be overfilled with oil.

i used oem spec oils and the garage put a different oil in to top up to correct level, it's a top quality oil in corect spec.

what could it be?
 
been quite hot and humid last few days...will make a difference to a high revving n/a engine