Oggi la mia connesione va molto meglio, secondo il test di tin.it vado a 250kb/s e scarico intorno ai 20kb/s.

questa è la mia situazione:
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TCP options string = 020405b401010402

MTU = 1500
MTU is fully optimized for broadband.

MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.

Default Receive Window (RWIN) = 23360
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 23360
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 934.4 kbps (116.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 373.76 kbps (46.72 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 121 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000
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Cambio qualcosa??

Grazie