In my opinion, that cultural napping aspect comes from the fact that it used to be too hot to concentrate around that time of the day. And the tradition has not adapted to aircons yet.
What makes it performative is that this type of nap is taken in a conspicuous spot, so you will be seen to be napping at work as apposed to finding some out of the way place. This is what struck me initially, not that people were napping at work, but where they were doing it.
I used to work for Huawei where taking a nap at your desk was the norm. If I'm taking ~15 minutes to recharge, why the hell would I waste any time searching for an out of the way place? And given that napping isn't frowned upon, there won't be any such places left because everyone would be doing it.
