Opening queries causes srt file to grow were comparable FOR EACH statement does not

Opening queries causes srt file to grow were comparable FOR EACH statement does not
Using a query to sequentially read a large number of records
Loop fetching records via query runs slower than a comparable FOR EACH loop
srt client temp-file grows to large size

This is expected behavior.

Unlike the FOR EACH statement, queries have the possibility to be navigated backwards and to be repositioned to specific records. To support this behavior, queries have to maintain a result list, which will be stored in the srt file if it can't fit in memory.
The size of the result list is directly related to the number of records that match the query criteria.

Starting with the Progress 9.1D05 and OpenEdge 10.0A releases, the use of result lists for queries can be suppressed by using the FORWARD-ONLY attribute of the query.

To help reduce the srt file growth ensure that all queries are closed when they are no longer needed as any space used by the query in the srt file will then be reused.
References to Written Documentation:

Progress Solutions:
P18639, How can I reduce the size of the .SRT file in Progress?