That is exactly the reason if you are looking for performance you should use slot.
Slots are still mutable, so they don't help with most of those concerns.
(also: http://lucumr.pocoo.org/2014/8/16/the-python-i-would-like-to...)
(also: http://lucumr.pocoo.org/2014/8/16/the-python-i-would-like-to...)
Everything described here, for starters: https://news.ycombinator.com/item?id=11522767