i am thinking this
if you have in squid (Mikrotik), a 80 Gb HD, and use this for cache websites, is to big, when a user go to example http://www.google.com the webproxy need search in very big disk. i know the algorithm in squid BUT!!!
now, in you experience which is the magic number for webproxy "Maximun cache size" i am thinking for example put 2 Gb for more fast search in hard disk. and no use "unlimited" only put "unlimited for ram cache"
what you thinks about this.
thanks very much