The e621 API page says that you should not make more than 1 request per second, but https://danbooru.donmai.us/wiki_pages/help:api says that API reads are not limited.

Is it allowed to have API reads faster than 1 request/second?

Api page is a mix of old and tiny part of new. Ignore it for now.

zepiwolf said:
https://danbooru.donmai.us/wiki_pages/help:api says that API reads are not limited.

Is it allowed to have API reads faster than 1 request/second?

You should refer to E6s API for E6 things. I'm pretty sure E6 still has an enforced limit of 2/sec, however you should try your best to keep it at 1/sec.

Given the number on profile pages, it might be enforced at 1/sec now.

aobird said:
Api page is a mix of old and tiny part of new. Ignore it for now.

Adding/updating docs while changing the API isn't that hard.

You just have to open a text file (preferably markdown) and use your keyboard.

Heck, you don't even have to start from scratch or write a complete essay: There is a special document within the repo for describing the api. It hasn't been touched for 2 years. It's sheer unwillingness despite you've the complete possibility to update the docs.