で、httpdのログみるとほとんどのステータスが304になってるので、実際にはデータ転送起こってないですね。
(ほとんど負荷になっていない、というか狙い通りに負荷軽減できている)

206.223.150.190 - - [29/Jul/2004:00:01:02 -0700] "GET /mnewsplus/dat/1091069714.dat HTTP/1.0" 200 15854 "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:04 -0700] "GET /mnewsplus/dat/1090959539.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:04 -0700] "GET /mnewsplus/dat/1090476175.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:04 -0700] "GET /mnewsplus/dat/1090961760.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:05 -0700] "GET /mnewsplus/dat/1090531971.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:07 -0700] "GET /mnewsplus/dat/1091061442.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:07 -0700] "GET /mnewsplus/dat/1091066797.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:07 -0700] "GET /mnewsplus/dat/1091082314.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"
206.223.150.190 - - [29/Jul/2004:00:01:07 -0700] "GET /mnewsplus/dat/1090959539.dat HTTP/1.0" 304 - "-" "Monazilla/1.00 (classic/0.4.040706)"

>>842
そのはずです。
でも、このへんは私よりc系の中の人のほうが把握しているはず。