Somebody posted this on reddit.
It shows the mob densitiy in higher level maps.
@STAFF_Ethan @Staff_Julie You can increase the spawn RATE all you want…with so few mobs the rate wont help much. Change the goddamn spawn system back to what it used to be please.
And, I think I should add this as my signature, “Play your own game!”
Clearly.
Spawnrate needs to be increased. That or the number of spawns.
…
I wrote my own opinion about something like this just some minutes ago… i hope you won’t mind if i link it here since it0’s relevant to the subject:
It was actually discovered the spawn rates were not increased at all, what was increased was the rate at which ambush mobs will pop up as you walk around the map, which is obviously not what anyone was asking for.
Seriously? Thats very disappointing.
That specific map was always awful in terms of spawns.
Roxona, Ruklys High Street, Downtown etc. maps ( basically the 180~210 zones) are much better.
They need to do a major revise on the spawn rates. 
We need maps filled of monsters for that fun grind, maybe one of the biggest problems we have right now is it. This denies us the fun of playing ToS more than bots, ksers, some class unbalance or even small quest bugs.
Might be true, but the fact remains that its no fun this way.
Its not just ‘might be true’. Balancing spawn rate is a good point but that map specifically, among very few others, have irrationally low spawns.
Maps around it have like 10x the spawn rate.