once the flaps are mostly out, and all those wheels down, it becomes a flying brick!
Aha! You put another parameter into the equation: Landing gear!
Both the 744 and the 742 become relative bricks with the rubber in the breeze. However, most pilots are more reluctant to drop the gear than to raise the speedbrakes! The other piece of that equation is that the gear is almost NEVER dropped if the pilot expects the drag requirement to be REDUCED after the lever is moved.
If the goal is to satisfy ATC AND the local populace, hanging the wheels out is NOT the answer! A bit of early flaps and a few extra N1s work a lot better...
BTW, put anti-ice and its higher N1 requirement into the equation, and the 744 is damn near impossible to "slam-dunk" without the wheels hanging!