Hello,
I tried what you said to find the cause of the slow loading time.
However, every queries in the Kibana APM App seems to very slow.
I captured all queries and made a google sheet.
Elastic APM Slow Queries Google Sheet
All data is on 'Time' sheet, and on Page1, Page2, Page3 sheets I put a captured Kibana screen with Chrome dev tool result.
One more thing I want to ask is,
I found THIS APM Issue on APM project, and this issue is quite related to the APM latency problem. Is it right?