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One of my customer came with a problem of speed for varnish. Long debug, short : When varnish get an object from his cache (memory), it's really sluggish (> 5 seconds), when varnish need to get the object from the apache backend, no speed problem (< 1 second). Exemple of a slow request (from varnishlog) : 193 ReqStart c <client ip> 59490 1329239608 193 RxRequest c GET 193 RxURL c /<my_url>/toto.png 193 RxProtocol c HTTP/1.1 193 RxHeader c Accept: */* 193 RxHeader c Referer: <my_referer> 193 RxHeader c Accept-Language: fr 193 RxHeader c User-Agent: <client_useragent> 193 RxHeader c Accept-Encoding: gzip, deflate 193 RxHeader c Host: <my_vhost> 193 RxHeader c Connection: Keep-Alive 193 VCL_call c recv lookup 193 VCL_call c hash 193 Hash c /<my_url>/toto.png 193 Hash c <my_vhost> 193 VCL_return c hash 193 Hit c 1329136358 193 VCL_call c hit deliver 193 VCL_call c deliver deliver 193 TxProtocol c HTTP/1.1 193 TxStatus c 200 193 TxResponse c OK 193 TxHeader c Server: Apache 193 TxHeader c Last-Modified: Mon, 18 Jun 2012 08:57:46 GMT 193 TxHeader c ETag: "c330-4c2bb5c0ef680" 193 TxHeader c Cache-Control: max-age=1200 193 TxHeader c Content-Type: image/png 193 TxHeader c Content-Length: 49968 193 TxHeader c Accept-Ranges: bytes 193 TxHeader c Date: Tue, 16 Oct 2012 06:54:03 GMT 193 TxHeader c X-Varnish: 1329239608 1329136358 193 TxHeader c Age: 391 193 TxHeader c Via: 1.1 varnish 193 TxHeader c Connection: keep-alive 193 TxHeader c X-Cache: HIT 193 TxHeader c X-Cache-Hits: 210 193 Length c 49968 193 ReqEnd c 1329239608 1350370443.778280735 1350370480.921206713 0.372072458 0.000045538 37.142880440 If I'm true, the problem is on th

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