The phrase "phenomenal rate" means an exceptionally high or extraordinary speed or pace.
Sentences with «phenomenal rate»
Some of them are growing at phenomenal rates by offering zero per cent fees / shares in the brokerage, and nominal charges per transaction. (remonline.com)
That's a pretty phenomenal rating and that's because this book is phenomenal. (elizabeth-finch.com)
Almost every retailer on the list experienced at least some growth since the beginning of 2014, with some expanding at a rather phenomenal rate. (petbusiness.com)