Mitsubishi L-series Retain Latched devices

Hi peoples,

There are a few counters that I would like to be retained after PLC is powered down.
I heard you can do it under "PLC Parameter" screen, and set the range that you would like to Latch.

My question is, is there any problems with making all the devices latch?
Does it kill the memory (e.g. memory has limited read-write cycles), or make it slower, or anything detrimental like that?

Thanks.

the Mits PLC's have a retentative area usually above 128

According to what I have found so far, the L-Series PLC needs to manually set which range of memory is retained.
I just don't know if there is any reason against setting all the memory to be retained. (Assuming I initialise my variables properly).

Please post the Model Number of the PLC

It's Mitsubishi L02CPU.
Under GX Works2 >> PLC Parameter >> Device tab, I can set which memory areas are "latched".
Thanks!