dimenticavo il sistema è windows xp sp2
Niente da fare nemmeno con TCP Optimizer, i valori che mi da speedguide sono sempre gli stessi. Come connessione ho 3435 kbps in download e 447kbps in up (connessione tiscali 4mega) sono molto sotto gli standard?

TCP options string = 020405980103030201010402

MTU = 1472
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 = 1432
Maximum useful data in each packet = 1432, which equals MSS.

Default TCP Receive Window (RWIN) = 257760
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled TCP Receive Window = 64440

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
504064 (MSS x 44 * scale factor of 8)
252032 (MSS x 44 * scale factor of 4)
126016 (MSS x 44 * scale factor of 2)
63008 (MSS x 44)

bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 10310 kbps (1289 KBytes/s) @ 200ms
Your TCP Window limits you to: 4124 kbps (516 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 54 hops
TTL value is ok.

Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349) = 00000000 (0)