firewall-cmd --reload takes a long time because of loading the huge amount of rules

Issue

• firewall-cmd --reload takes a long time and system stops connection during the time.

# time firewall-cmd --reload
success

real    0m46.997s
user    0m0.132s
sys     0m0.018s

• In the environment, there are rules of a huge amount of source ip address.

# firewall-cmd --info-zone=public
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: eth0
  sources: 192.168.0.1 192.168.0.2 192.168.0.3 192.168.0.4 192.168.0.5 192.168.0.6 ...   <<<--- huge amount of rules
  services: dhcpv6-client ssh
  ports: 
  protocols: 
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: