A jvb Process starts 50 threads for a one-to-one conference, 4200 threads for 80 one-to-one conference

A jvb Process starts 50 threads for a one-to-one conference, 4200 threads for 80 one-to-one 。 When 80 active one-to-one conferences in jvb Process,CPU can reach 20% with eight-core Intel ® Xeon® E3-1230 v6 @ 3.50GHz CPU, is this phenomenon normal ? Compared with https://jitsi.org/jitsi-videobridge-performance-evaluation/ , performance is only 10%。