Kms cpu used 100%

My machine is 4-core 8G and uses OpenVidu 2.15.0 and KMS 6.14.0. Today, there was a meeting of 10 people and it lasted for 5 hours. The CPU usage of the machine was 110%, then suddenly it reached 400%, KMS occupied 370%, turn occupied 20%, and the CPU decreased after the meeting stopped. Can someone help me?