Ma come è possibile?Dopo alcuni anni faccio l'analisi con SpeedGuide.net TCP/IP Analyzer,premetto che per farla ho dovuto disattivare il firewall del mio router hamlet 7500,e mi dà risultati tutti sballati:

SpeedGuide.net TCP/IP Analyzer

IP Address:
Client OS: Windows XP
Browser: Mozilla/5.0 (Windows; U; Windows ) Firefox/3.5.7
Please Read the Analyzer FAQ if the above is not your IP address.
TCP options string
MTU = 1452
MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.
MSS = 1412
MSS is not optimized for broadband. Consider increasing your MTU value.
Default TCP Receive Window (RWIN) = 257020
RWIN Scaling (RFC1323) = 2 bits (scale factor: 2^2=4)
Unscaled TCP Receive Window = 64255

For optimum performance, consider changing RWIN to a multiple of MSS.
Other RWIN values that might work well with your current MTU/MSS:
64952 (up to 2 Mbit lines, depending on latency. MSS * 46)
129904 (1-5 Mbit lines, depending on latency. MSS * 46 * 2)
259808 (2-14 Mbit lines, depending on latency. MSS * 46 * 2^2)
519616 (8-30 Mbit lines, depending on latency. MSS * 46 * 2^3)
1039232 (25-60 Mbit lines depending on latency. MSS * 46 * 2^4)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 10281 kbps (1285 KBytes/s) @ 200ms
Your TCP Window limits you to: 4112 kbps (514 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 42 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

come si puo' vedere è un mezzo casino,dati inesatti,che non corrispondono ai miei se li verifico con TCP optimizer.Cosa mi potete dire,non penso di usare proxy normale o trasparente?