Hi @Jeff Cleath ,
I would enable Applicaiton Insights, see https://azure.microsoft.com/en-us/blog/usage-analytics-for-wordpress-with-azure-app-insights/, to determine your latency is occurring. There could be any number of issues, such as badly performing plugin, database optimizations, compressing images using WP Smush It or lazy loading them if you have a lot.
For plugins, I would also suggest using debug objects and query monitor to see if there is an offending plugin. If you're running your WordPress site in a lower SKU like Free or Shared, I would also suggest scaling up your app service plan to a dedicated plan starting with Basic and see if there is any improvement.