I guess nothing beats 200% fcr light sorc in P1, other than maybe a hammerdin. Theyre meta for a reason

Java is better for cows and perhaps even Baal, but since you want to farm a bunch of areas, a javazons can't compete.
PSN Necro is great at clearing screens of monsters but his DPS sucks vs bosses, so there's that
Any melee character is out by default, other than perhaps a ww barb, but I doubt he clears faster than lightning sorc or hammerdin
Traps can't compete I think, setting down traps takes time, so out of the contest
Druid could actually make it to the top as well, unsure how he would fare against cold immunes though, suppose it reduces clear speed, I don't play druids, so idk
Did I miss any character?