Keeping OS/400 objects permanently on main memory

My system ERROS uses the the same code for both application development and
for production of those applications, whatever the applications do, and that
code allows both development and production to be done using 5250 or a
browser as ERROS either dynamically generates 5250 attributes or uses CGI
and dynamically generates HTML and Javascript as required. The total code
with observability removed is under 7Mb. There is also a single display file
of about 750Kb but that is only opened in 5250 mode. As the program code is
used by all users, it seems that it might be a good idea to ensure that it
is always in main memory. I seem to remember that there is a way of making
sure that this happens. Can anyone please remind me how and does anyone
have a view on whether this is a good idea? Does anyone have any other
ideas?

There is also a 46Mb physical file that contains the meta data for all ERROS
created applications including application development and it might be a
good idea to do the same with this.

I am running V5R1 and have 2.8Gb memory in the partition. I use journalling
and remote journalling but these don't consume much CPU time. Although I
have plenty of spare capacity, I am trying to find ways of making ERROS as
efficient as possible.

Many thanks,