RE: ***SUSPECT*** RE: Subfile initial load very slow

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Remember, a "page at a time" design requires the subfile program to keep
track of which records are currently displayed and to load/reload the
subfile as the user pages or
browses through the data, so there is a fair amount of logic to do this.
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If you use uneven SFLSIZ, SFLPAG values the only time you need to add more
records is when the user rolls past the last record in the subfile.

Rolling up and down thru the screen records does not even return control to
your program. Except when the user rolls past the beginning or past the last
record.

So really you only need to track the Maximum Subfile Number that has been
used, and if you are at the Top or the Bottom of the subfile.

If at the Top, do nothing except redisplay the 1st subfile record.
If at the Bottom, use the Maximum Subfile Number you saved to start adding
more records. The highest subfile number becomes the new Maximum value.
Redisplay use the screen using the Maximum Subfile Number to reposition the
screen to the new page of subfile records.

Assuming the logic flows smoothly, it's pretty easy and requires little code
changes to build as you go.