About the lag - at this stage there won't be any noticeable
difference yet, but as we all know:
ppl tend to use already existing work instead of creating
everything from scratch again, so that in case of more complexity there will be off course at one point some performance difference - one day.
Also as OFP is limited in usage of groups or units, it's always
wise to reduce things to a minimum of resources, as every
gamelogic you can save here - will be one more free gamelogic
to be used there.
About them to follow the player all the time:
Nope - it will do exactly the same as when using the gamelogic,
as you only send them to the actual position of the player (or
in previous case the gamelogic) ... and nothing more.
:note - the loop's interval of 30 seconds has not been changed
~S~ CD