just copy n paste from eb forum,q n a with kristoff about the lag.

Q. You have mentioned that the clutch is almost completely open while standing still with D engaged, is this the prime reason of slight lagging when slowly pressing the gas to move?

A. Yes, if you release the brake and im
mediately press the gas, this is the case. It is always better not to press the gas immediately unless you have to (uphill), you will notive less delay. That it isn't superagressive at launch (if you would mean this by lag) is calibration, it isto preserve both engine and CVT. it is called torque reduction, the engines power delivery is minimized, although full trottle.

as punch representative reply,in simple term,when u r already in D,let the car crawl 1st on its own before apply throttle,unless the situation demand it.

if u are at neutral, engage to D a bit earlier, maybe half a second than normal at/torque converter cvt to let the clutch builds its pressure.

but dont expect the rpm will raise hand in hand with speed during stop n go situation cuz its clutch type cvt,n it does behave like manual trans.

low speed jerking will.be lesser overtime,but it wont completely gone.

yup,its due to clutch,like u r driving manual box in 1st gear delay unlesa the clutch is fully open/release. not evidence if using torque converter.

it will be a pain transition to those familiar with torque conv type.

i think it needs not only tcu update,but ecu update also. since its using bosch motronic,totally new n diff from prev conti easyu 32bit controller(which already have its last update earlier this year to solve chocking prob due to cold start n reduce launch delay), i think it will take more time to calibrate it. dunno whether they will come out with it or not or it will be that apparent.

by the way, when u service ur iriz,ask them to check with padt n check whether ir tcu is using the latest firmware. if not,ask them to reflash it.

it only can be done at branch sc though.