Plotly API throttle limits


I have been hitting some throttling limits, and I want to pay for and upgrade my plan to avoid limits completely.

I am interpreting the documentation ( that upgrading to a professional tier will mean there are no limits or throttling restrictions on the API. Is that correct? There are some perhaps out of date documentation that contradict this so I don’t want to pay for the year and still run into throttling problems.
What about the other tiers?

Thanks in advance.