CPU usage grows with time

[AlexZhenWang]

Flags:

--base-path=/chain-data
--rpc-cors=all
--port=26302
--rpc-port=9933
--ws-port=9944
--chain=edgeware
--ws-external
--rpc-external
--rpc-methods=Safe
--pruning=archive
--ws-max-connections=250
--db-cache=2000

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Hi, I found the CPU usage of my node grows with time, I check the CPU usage by process and found the http.worker processes take lots of CPU resource. Please any idea how I can avoid this? (Any suggestions would be greatly appreciated!)