Io avevo una Tin.it 256/128. Dopo l'upgrade non riesco a superare i 30/35 KB/s in download sia che scarichi con il mulo sia scaricando da server come download.com, apple.com ecc. Questo problema si risolve in tarda serata quando riesco a raggiungere i 70/75. X l'up nessun problema. Di seguito vi posto qualche test che ho fatto

Luxa: 42 KB/s
Virgilio: 341 Kb/s
Alice: 46,28 KB/s
Ping www.ngi.it: 54ms
Speedguide:
MTU = 1480
MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.
MSS = 1440
MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 31240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 31240

For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
506880 (MSS x 44 * scale factor of 8)
253440 (MSS x 44 * scale factor of 4)
126720 (MSS x 44 * scale factor of 2)
63360 (MSS x 44)
bandwidth * delay product:

Your RcvWindow limits you to: 1249.6 kbps (156.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 499.84 kbps (62.48 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 120 hops

TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000

Mi potete aiutare a capire??