If you aren't enjoying Delirium, try not activating the mirror and get the 1st and the last checkpoint. Go back to the first checkpoint and activate the mirror and wait for the bar to fill up, then teleport to the last checkpoint. All the mirrors will be stacked at the end
This results in less loot and making it rippier, but its a fun loot explosion at the end and i enjoy it quite a bit more than finding the mirrors as i go!