How much network latency is between you and the load balancer, and between the load balancer and the web servers? Normally, the initial TLS connection should be around 4 * the network latency, and subsequent requests should be very close to the network latency.
I'm having issues reaching IP addresses unrelated to Cloudflare. Based on some traceroutes, it seems AS174 (Cogent) and AS3356 (Level 3) are experiencing major outages.
ip-api.com was also affected by this.
After our first alert at 10:49 (cert expired at 10:48:38) and a minute of being puzzled as to why our certificate expired, we realized the root we bundled is the issue. We finished updating our primary API servers at 10:55.