[squid-users] delaypolls

what is this paramenter mean ?

acl domain-nakal url_regex -i "/etc/squid/domain-nakal.txt"
acl nakal url_regex -i "/etc/squid/ext-nakal.txt"
acl porn url_regex -i "/etc/squid/porn.txt"

delay_pools 2
delay_class 1 1
delay_parameters 1 32000/32000 2500/64000
delay_access 1 allow domain-nakal !free
delay_access 1 allow nakal !free
delay_access 1 deny ALL

delay_class 2 1
delay_parameters 2 1000/1000 1000/2800
delay_access 2 allow porn !free
delay_access 2 deny ALL

please tell me in english

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