If you know what packets to block, l2t functions awesomely. If you block onmagicskilluse, then yeah skillbased chars wont work properly, but melee with few self buffs work.

I block CIPacket to not load players, AutoAttackStart to not load attack stance animation, I block onmagicskilluse on skills that aren't my main nukes (selfbuffs / ss / bss), so char will function properly.
Block npcinfo packet with filter for gks/buffer/mobs of my bots/grocery so no other npc spawns.

I have my client on rendermode 7 to only load vectors, doesn't even load textures.

70-140mb ram usage per client.