There are a few PDFs that are available via the TechCon conference download site. All TechCon participants have access to titles like V10.0.0.0-DP-APIC-benmarks-and-capcity-planning-2.pdf. I updated the k8s content in the 613_API-Gateway-perf-best-practices-k8s.pdf. If you're looking for X3 physical appliance data see TechConn2023-session-332.pdf.
If you are not a TechCon participant, please ask your IBM account team to get you registered and access is retroactive to previous years content.