Dust Man - Crusher Room
The screen after Eddie and the Checkpoint is a crusher room. Strategies for this room tend to be cycle based.
This room in particular is covered by Chelney's tutorial videos.
Note you should switch to the desired weapon in the checkpoint room.
Fastest Strat - Ring
Climb the ladder, slide right. Fire a ring (kills the met), slide again.
Full Jump against the pile of trash, and at the very top of the jump, fire ring. Jump again, so the ring flies horizontally back to Mega Man. This should clear the top two layers of blocks about 4 blocks deep.
Buster Strats
Climb the ladder with a full charge. Slide once towards the met, and when it is vulnerable release the charge shot. This will destroy a lot of blocks.
Dust Zip
There is a zip in this section, however it is slower than the optimal Ring Strat.