We have a VPN tunnel to another company and use it to move large files\n(20-100M). We are only able to achieve ~250kByte transfer speeds. The\nping-time is ~250ms. We are using a 9M partial DS3 with a PIX 525 and the\nreceive site has 100M burst capability (unsure as to the equipment on the rx\nend).\n\nYes, I have tried adjusting the RWIN during testing. No, the application is\nnot able to create multiple send threads/streams. Is there a calculation to\nverify the transfer speed and factor the latency? What else could we look\ninto to try and improve the tunnel speed?