Script eats up all memory during sub-item list printing

I've recently discovered, that when we have sub-item (e.g. phrase, order items) list on the template with per_page="-1" parameter set, then it prints all records related to particular main item (e.g. language, order). This is not a problem, when we have main item ID somehow available on the page or in the url.

When main item ID is missing, then all data from the table is printed. When we have thousands of records in database, then printing them on one page will probably eat up all available memory. This is exactly what I've noticed.

To verify that try to set [b]per_page="-1"[/b] for phrase list (under "regional" folder in administrative console) and then just visit phrase listing template from browser.