If you change the acceleration region, the back-to-origin traffic may increase and the node hit rate may decrease.
After the acceleration region is changed from Chinese Mainland to global, CDN nodes outside the Chinese mainland are added. These nodes have not cached the resources from your origin server. Therefore, when requests are sent to these new nodes, the nodes must retrieve resources from your origin server. This results in an increase in the back-to-origin traffic in a short period of time. At the same time, the overall node hit rate is reduced.
If the back-to-origin traffic increases, you must check your origin server in real time to ensure that it can withstand the increased back-to-origin traffic. CDN L2 nodes can greatly minimize the back-to-origin traffic. However, to prevent possible risks, we recommend that you pay attention to the pressure on your origin server after you change the acceleration region.