I assume you know D2 have parameter -act5 right ?
if performance is your issue maybe you could try this parameter
maybe with that you could get more performance
or even use force framerate feature just after that lq, to get more
(because D2 is at 25 fps standard)
example of real use on shortcut :"C:\Games\Diablo II\Diablo II.exe" -w -lq -direct -fr 25
for more info read
source : http://diablo.wikia.com/wiki/Game_commands