In Director + Lime, I think is very important (to free the textureMemory) to destroy the tilesets of the map before changing the scene. I'm afraid that map:destroy() doesn't do it properly.

I've tried...:

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function clean (event)
 
local tileset = map:getTileset("bars")-- name of my tileset
tileset:destroy()
 
map:destroy()
 
end