USRSPC vs. Local data

Are there any access speed differences processing data from a user space
compared with local data ?

D  Rcd1           S             82    DIM(300)
D  Rcd2           S             82    DIM(300)   BASED(pRcd2) // Pointer to
a userspace

Lets say i want to load 300 records in an array and sort it, sorting Rcd2
would be slower than Rcd1 ?

Im considering storing the data in a userspace, becouse there are chances
that the same dataset (300 records per dataset) need to be reprocessed
again, storing a userspace in qtemp by each recordset would avoid to re-read
and sort the records.
What im really wondering is if the access to the data stored in a user space
is a plain memory access just like accesing any other variable, if so, i
think my new approach is better that the current one.

Any thoughts ?

Carlos Kozuszko