The memory effect does not manifest itself in a lag in respons, nor in a slow moving needle (that's another of CdS cell's 'habits').
It shows itself in values that are too high, after the cell has been exposed to high light levels.

CdS cell's slowness also is not a lag in response, but rather that it takes the meter to stop moving and show the final measured value.
It builds up, but it starts doing so immediately.

I would think that a meter that stays motionless for a while, then jumps into action, has another problem than using a CdS cell.