Heavy Memory load-1.9G memory usage with 30 clients.
This is log from systemctl status:

webminepool.service - webminepool
   Loaded: loaded (/etc/systemd/system/webminepool.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-05-15 14:07:42 CST; 23h ago
 Main PID: 32101 (mono)
    Tasks: 27
   Memory: 1.9G
      CPU: 2min 5.597s
............................
May 16 13:42:19 ubuntu mono[32101]: 288cfc97-1f09-4c55-899d-0f821e585b53: got job from pool
May 16 13:42:19 ubuntu mono[32101]: Connecting: 127.0.0.1
May 16 13:42:19 ubuntu mono[32101]: 2cf1c3d3-e122-43f8-bb9d-ad27548928d8: connected with ip 127.0.0.1
May 16 13:42:19 ubuntu mono[32101]: 2cf1c3d3-e122-43f8-bb9d-ad27548928d8: handshake - aeon-pool.com, Wmsng3CK...
May 16 13:42:19 ubuntu mono[32101]: 2cf1c3d3-e122-43f8-bb9d-ad27548928d8: reusing pool connection
May 16 13:42:19 ubuntu mono[32101]: 2cf1c3d3-e122-43f8-bb9d-ad27548928d8: got job from pool
May 16 13:42:24 ubuntu mono[32101]: [5/16/2018 1:42:24 PM] heartbeat; connections client/pool: 30/2; jobqueue: 34.3k; speed: 0.8kH/s
May 16 13:42:25 ubuntu mono[32101]: b7994290-09fc-4f04-a50d-d900f1bfcc5c: reports solved hash
May 16 13:42:25 ubuntu mono[32101]: b7994290-09fc-4f04-a50d-d900f1bfcc5c: got hash-checked
May 16 13:42:25 ubuntu mono[32101]: b7994290-09fc-4f04-a50d-d900f1bfcc5c: solved job
............................
May 16 13:46:14 ubuntu mono[32101]: [5/16/2018 1:46:14 PM] heartbeat; connections client/pool: 25/2; jobqueue: 34.3k; speed: 1.2kH/s
....................................

My server: ubuntu16.04 , run webminerpool behind nginx
Any suggestion would be appreciated！