Deeply nesting endpoints within multiple namespaces leads to large jumps in latency and cpu usage

In my unit tests when I execute 10 simultaneous requests to a deeply nested endpoint of the form ':path_param1/namespaces1/:path_param2/namespace2/:path_param3/namespace3/namespace4/:path_param4' it takes 60 seconds to complete and CPU consumed by Ruby peaks at over 90%.

If I flatten that endpoint out and have it at the top level instead and have it named post ':path_param1/namespaces1/:path_param2/namespace2/:path_param3/namespace3/namespace4/:path_param4' do then 10 simultaneous requests to that endpoint complete in a few seconds and Ruby consumes only a few mb of CPU.

I will post some code to reproduce the issue here asap...