What are the rate limits for Taboola?

We recently started facing issues for our accounts regarding the overall data speed, so we wanted to understand the hourly/daily rate limits for Taboola?

The doc mentions 10 calls/min but I saw some other comments from Taboola admins recommending 10 calls/sec, so thus wanted some clarity on this.

Overall I do have 3 questions:

Was there a temporary issue regarding the slowness of the APIs?
What are the rate limits per sec/min/hour?
Are there rate limits per day?