subfile loading question!

Hi all,
   i have a situation with a subfile pgm where the SUBSIZ is 6 & SUBPAG
is 5 .Indicator 85 is rolldown indicator & 84 is rollup.Records r
read,written & displayed 5 at a time with each subsequent pagedown
which is handled in the pgm via *IN85.Pageup has no logic since after 3
pagedowns when 20 records r displayed -the previous 15 records r
already in the subfile & need not be accessed again.
     However,the problem is our customer record file being very very
large comprising of millions of records
it causes a performance issue since the process is very slow.To handle
pagedown -- i think there is no better method than used in the pgm so
what then, should i do so that the process is not slow ?

Pl let me know if there is any other way to handle this & improve
performance time.
Thanx for ur help in advance.

 
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