ciao a tutti! ho fatto il test di speedguide, sono corrette queste impostazioni?!?
codice:
TCP options string = 020405b40103030001010402 
MTU = 1500 
MTU is fully optimized for broadband. 
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
 
Default Receive Window (RWIN) = 8760 
RWIN Scaling (RFC1323) = 0 bits 
Unscaled Receive Window = 8760 

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: 350.4 kbps (43.8 KBytes/s) @ 200ms
Your RcvWindow limits you to: 140.16 kbps (17.52 KBytes/s) @ 500ms
Consider increasing your RWIN value to optimize TCP/IP for broadband. 
MTU Discovery (RFC1191) = ON 
Time to live left = 56 hops

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