Oracle Database Discussions

Hi All;
Please help me on how can we configure the number of RFS processes in dataguard.
1 - Are we able to increase the number of RFS processes.
2 - If we can, how should we decide the appropriate number?

(Main problem: My standby database is not able to catch primary database's archivelog generation speed.)

Here i have 4 RFS processes which i find inadequate .

SQL> SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY where process='RFS';

PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS
--------- ------------ ---------- ---------- ---------- ----------
RFS IDLE 1 687797 419841 10240
RFS IDLE 1 687800 112641 10240
RFS IDLE 1 687798 307201 10240
RFS IDLE 1 687904 110594 8192

Thanks for your comments.
Emre