[Zope] apache proxy problem

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hello


i'm running zope 2.3.1 behind apache with mod_proxy and mod_ssl
apache is running on freebsd 4.2 with ipfilter
with a siteroot i do virtualhosting
the zope is running on win2k as a service
when i access the page the first time (no ssl) then it takes about 30
seconds to show up
if i browse further the speed is alright

and some images won't load the first time, i need to do a refresh and the
image appears

if i access the page behind the firewall directly, there are no problems
it seems that this is an apache issue ??

i havn't set any http headers explicitly to set the expiration time

can anybody help

thx