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Only 23% of traf is cached. Config problem?

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These are my Squid stats. I have about 23% of cache hits.
We have 300 users. This is a school environment where most students
access the same site at the same time for their classroom activity.
Is there anything I should add or change to make the caching better,
or is 23% to be expected?

Proxy statistics	  	
Total amount:	 requests	 263,840
Total Bandwidth:	 Byte	 2634M
Proxy efficiency (HIT [kB/sec] / DIRECT [kB/sec]):	 factor	 5.72
Average speed increase:	 %	 16.58
TCP response time of 100%% requests:	 msec	 5048

Cache statistics	  	
Total amount cached:	 requests	 61936
Request hit rate:	 %	 23.47
Bandwidth savings:	 Byte	 454M
Bandwidth savings in Percent (Byte hit rate):	 %	 17.24
Average cached object size:	 Byte	 7686
Average direct object size:	 Byte	 11319
Average object size:	 Byte	 10466

Squid box is 2.4 GHz P4, 1GB memory, 40 GB IDE disk.
Squid version 3.1.3 on Debian.

Config file:
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl localnet src 176.16.0.0/21 #176.16.0.-176.16.3.254 range
acl localnet2 src 192.168.11.0/24 #192.168.11.0-254 range
acl localnet3 src 192.168.200.0/24 #192.168.200.0-254 range
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 CONNECT method CONNECT
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access allow localnet
http_access allow localnet2
http_access allow localnet3
http_access allow all #not restricted because its behind the firewall
and serving local LAN only. I'm just trying to get this working for
now...
icp_access allow all
htcp_access allow all
http_port 3128 transparent # ok, transparent proxy, no NATing. Not
sure what WPAD/PAC is...
hierarchy_stoplist cgi-bin ?
access_log /var/log/squid3/access.log squid
refresh_pattern ^ftp:           1440    20%     10080
refresh_pattern ^gopher:        1440    0%      1440
refresh_pattern (cgi-bin|\?)    0       0%      0
refresh_pattern . 0 40% 40320
icp_port 3130
coredump_dir /var/spool/squid3
refresh_pattern -i \.index.(html|htm)$ 0 40% 10080
refresh_pattern -i \.(html|htm|css|js)$ 1440 40% 40320
cache_mgr help@xxxxxxxxxxxx
cache_dir ufs /var/spool/squid3 7000 16 256
visible_hostname gw.mydomain.org


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