Regrettably, my experience has been similar.

First, the sheer irritation of having to use the smallest display size in order that the magnified speed on the tape is the same as the actual speed.  My eyes are old and dim!

On levelling out in cruise the A/T randomly goes off duty (while still showing a green bar) with the A/P still engaged - usually leading to an overspeed situation.  Re-establishment of VNAV cruise also is random in the sequence that A/P, A/T, VNAV and pilot set speed are recycled or used.

It's impact on framerates is, as others have described,  is really heavy.  It is the heaviest impact of any complex airliner that I have in my hangar.

Mark, I know that you are simply a kind soul who helps us in our times of need, but could you pass these genuine concerns to the CS devs.  I really hope the development of this aircraft has not been frozen or abandoned.