At least according to the World Bank Group:
Sub-Saharan Africa has been the region with the highest number of reforms each year since 2012. This year, Doing Business captured a record 107 reforms across 40 economies in Sub-Saharan Africa, and the region’s private sector is feeling the impact of these improvements. The aver- age time and cost to register a business, for example, has declined from 59 days and 192% of income per capita in 2006 to 23 days and 40% of income per capita today. Furthermore, the average paid-in minimum capital has fallen from 212% of income per capita to 11% of income per capita in the same period.
See the 2019 Doing Business Report here.
Here are some questions from last year on the integrity of the Doing Business Index.