Recovery is slow on physical standby

Question

When delete stmts are issued on primary, resync/recovery process on standby side is very slow. Logs are shipped fine and fast , but recovery process is slow. Is there some configuration needs to be updated?
Normall all other dmls are fast in the resync process.
OS: RHEL5
Primary : RAC
Standby: Phy. standby on standalone

Answer 1

declare
vthread# NUMBER;
vsequence# NUMBER;
vfirst_time DATE;
vname VARCHAR2(513);
vapplied VARCHAR2(3);
vdest_id  NUMBER;
vsysdate date := sysdate ;
cursor lgsarcchk is
select thread#,sequence#,first_time,name,applied from V$ARCHIVED_LOG
where trunc(first_time) >= trunc(sysdate-3)
and applied='YES'
order BY first_time ;
begin
for lgsarc in lgsarcchk
loop
   if lgsarc.applied = 'YES' then
         dbms_output.put_line('Thread#'||lgsarc.thread#||' sequence# '|| rpad(lgsarc.sequence#,45)||' Status => '||lgsarc.applied||' applied at '||lgsarc.first_time);
  end if;
end loop;
end;
im using above cmd to check and also alert log of standby prints when it applies.
Alert log msg:
Media Recovery Log /MOUNTPOINT/DBNAME/ARCHIVELOGNUMBER.arc