Здравствуйте.
ОС Centos 7
squid 3.3
сеть 192.168.0.0/24

не режет скорость

acl SSL_ports port 443 # RFC1918 possible internal network
acl Safe_ports port 80 # RFC1918 possible internal network
acl Safe_ports port 21 # RFC1918 possible internal network
acl Safe_ports port 443 # RFC 4193 local private network range
acl Safe_ports port 70 # RFC 4291 link-local (directly plugged) machines

acl Safe_ports port 210
acl Safe_ports port 1025-65535 # http
acl Safe_ports port 280 # ftp
acl Safe_ports port 488 # https
acl Safe_ports port 591 # gopher
acl Safe_ports port 777 # wais
acl CONNECT method CONNECT # unregistered ports
acl test src 192.168.0.252

http_access deny !Safe_ports

http_access deny CONNECT !SSL_ports

http_access allow localhost manager
http_access deny manager

http_access allow localhost

http_access allow test
http_access deny all

http_port 3128 transparent

cache_dir ufs /var/spool/squid 1000 16 256

coredump_dir /var/spool/squid

cache_mem 2000 MB
delay_pools 1
delay_class 1 2
delay_parameters 1 125000/125000 125000/125000
delay_access 1 allow test
delay_access 1 deny all