Difference between Free Memory ID and Free Memory ID: in Performance ?

HI

I have to free say around 20 memory IDs.

Is it wise use

FREE MEMORY ID 1.
FREE MEMORY ID 2.
..
..
FREE MEMORY ID N.

or

FREE MEMORY ID: 1, 2, .... N.

Please dont mention about readability.

Please say about performance only. Will the later increase Performance or former ?

thanks,

Padma