Melhorando Cache

Pessoal, boa tarde, esse é o script do squid que utilizo

http_port 3128 transparent
icp_port 0
hierarchy_stoplist cgi-bin ?
acl QUERY urlpath_regex cgi-bin \?
cache deny QUERY
acl apache rep_header Server ^Apache
broken_vary_encoding allow apache
cache_mem 1024 MB
maximum_object_size_in_memory 256 KB
maximum_object_size 512 MB
minimum_object_size 0 KB
quick_abort_min -1 KB
cache_replacement_policy heap LFUDA
memory_replacement_policy heap GDSF
cache_swap_low 80
cache_swap_high 85
ipcache_size 1024
ipcache_low 90
ipcache_high 95
fqdncache_size 1024
cache_dir aufs /var/spool/squid/1/ 250000 16 256
cache_access_log /var/log/squid/access.log
refresh_pattern ^ftp: 15 20% 2280
refresh_pattern ^gopher: 15 0% 2280
refresh_pattern . 15 20% 2280
dns_nameservers 127.0.0.1
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 901 # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports

http_access allow localhost
http_access allow all
http_reply_access allow all
icp_access allow all

refresh_pattern -i \.jpg$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.gif$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.png$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.jpeg$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.bmp$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.tif$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.tiff$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.swf$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.exe$ 0 50% 21600 reload-into-ims
refresh_pattern -i \.php$ 0 20% 1440 reload-into-ims
refresh_pattern -i \.html$ 0 20% 1440 reload-into-ims
refresh_pattern -i \.htm$ 0 20% 1440 reload-into-ims
refresh_pattern -i \.shtml$ 0 20% 1440 reload-into-ims
refresh_pattern -i \.shtm$ 0 20% 1440 reload-into-ims
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern . 0 20% 4320

#Cache windowsupdate ( Faz cache do Windows Update ) ##
refresh_pattern windowsupdate.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims
refresh_pattern download.microsoft.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims
refresh_pattern www.download.microsoft.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims
refresh_pattern www.microsoft.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims
refresh_pattern au.download.windowsupdate.com/.*\.(cab|exe|dll|msi) 4320 100% 43200 reload-into-ims
refresh_pattern download.windowsupdate.com/.*\.(cab|exe|dll|msi) 4320 100% 43200 reload-into-ims
refresh_pattern http://www.download.windowsupdate.co...b|exe|dll|msi) 4320 100% 43200 reload-into-ims

#Cache atulizacao avira ( Faz cache do Avira ) ##
refresh_pattern personal.avira-update.com/.*\.(cab|exe|dll|msi|gz) 10080 100% 43200 reload-into-ims

#Cache atualizacao symantec
refresh_pattern liveupdate.symantecliveupdate.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims
refresh_pattern symantecliveupdate.com/.*\.(cab|exe|dll|msi) 10080 100% 43200 reload-into-ims

#Cache avast
refresh_pattern avast.com/.*\.(vpu|cab|stamp|exe) 10080 100% 43200 reload-into-ims

########### Cache Videos ###########
refresh_pattern -i .flv$ 10080 90% 999999 ignore-no-cache override-expire ignore-private

acl youtube dstdomain .youtube.com

cache allow youtube
################################

#zph_tos_local 0x30
#zph_tos_peer 0
#zph_tos_parent off
#zph_preserve_miss_tos on

#mime_table /etc/squid/mime.conf
pid_filename /var/run/proxy.pid
debug_options ALL,1
log_fqdn off

forwarded_for off
error_directory /usr/share/squid/errors/Portuguese
coredump_dir /var/cache/squid
detect_broken_pconn on
pipeline_prefetch on

Gostaria de saber o que posso colocar o reticar dele para melhorar meu cache e ganhar em velocidade e poupar banda

uso esse scrip em meu provedor de internet !!

obrigado a todos !