Is this the right performance using C++ and epoll in WSL2 if we consider it a black box testing?

Question

I am recently working on a simple HTTP server project using C++ and epoll facility running on Ubuntu in WSL2. Is this the right performance if I implement epoll facility correctly in this context? Or it is much lower than the expected performance, which means I did something wrong.

Here is my laptop specification: Processor 12th Gen Intel(R) Core(TM) i7-1255U Installed RAM 16.0 GB (15.7 GB usable) Edition Windows 11 Pro Version 23H2

I implement non-blocking sockets. There are ten working threads that read the request and write the response. I don't do any parse so far. So the server just sends a char array directly every time whatever it receives. There is also a main thread receiving events from epoll_wait and put events on a queue.

I test it by artillery running in WSL2 too on the same laptop. I close all other software. The test script is:

config:
  target: http://127.0.0.1:8086
  phases:
    - duration: 1
      arrivalRate: 10010
      name: Sustained peak load
  plugins:
    apdex: {}
  apdex:
    threshold: 100

scenarios:
  - flow:
      - loop:
        - get:
            url: "/"
        count: 40

The result is:

All VUs finished. Total time: 31 seconds

--------------------------------
Summary report @ 14:22:39(-0800)
--------------------------------

apdex.frustrated: .............................................................. 0
apdex.satisfied: ............................................................... 397875
apdex.tolerated: ............................................................... 2525
http.codes.200: ................................................................ 400400
http.downloaded_bytes: ......................................................... 86486400
http.request_rate: ............................................................. 14877/sec
http.requests: ................................................................. 400400
http.response_time:
  min: ......................................................................... 0
  max: ......................................................................... 300
  mean: ........................................................................ 29.4
  median: ...................................................................... 26.8
  p95: ......................................................................... 48.9
  p99: ......................................................................... 80.6
http.responses: ................................................................ 400400
vusers.completed: .............................................................. 10010
vusers.created: ................................................................ 10010
vusers.created_by_name.0: ...................................................... 10010
vusers.failed: ................................................................. 0
vusers.session_length:
  min: ......................................................................... 175.2
  max: ......................................................................... 2414.5
  mean: ........................................................................ 1230.5
  median: ...................................................................... 1176.4
  p95: ......................................................................... 1720.2
  p99: ......................................................................... 2101.1

Apdex score: 0.996846903096903 (excellent)

The code is long so it will take much time to read. But if it is necessary, I can put the code here.