SharePoint Latency and Optimiaztion over WAN

Colonel Sanders: Prepare ship for lightspeed!
Dark Helmet: No, no, no! Lightspeed's too slow!
Colonel Sanders: Lightspeed too slow?
Dark Helmet: Yes. We're going to have to go right to.......Ludicrous speed!

One key to an efficient workforce is providing pertinent information in a reliable and quick manner. SharePoint is an excellent foundation for this theory. However, if you have ever wanted to boost speed and increase performace, here is one option that I have used that may give you that extra umph! (THE FOLLOWING REQUIRES REGISTRY CHANGES TO SERVERS...TEST FIRST!!!)

RFC 1323

RFC 1323 is a high-speed transmission path that defines window scaling that allows a receiver to advertise a window size larger than 65,535 bytes.

"A TCP Window Scale option includes a window scaling factor that, when combined with the 16-bit Window field in the TCP header, can increase the receive window size to a maximum of approximately 1GB. The Window Scale option is sent only in synchronize (SYN) segments during the connection establishment process. Both TCP peers can indicate different window scaling factors to use for their receive window sizes. By allowing a sender to send more data on a connection, TCP window scaling allows TCP nodes to better utilize some types of transmission paths with high BDPs."

So in short it allows more information to be sent and recieved, ultimately speeding up performance. In our lab we were able to take an 8MB file that was previously downloading at around 10 seconds to just over 2 seconds.

Pre RFC 1323 tuning= 8MB/10 sec.
Post RFC 1323 tuning= 8MB/2 sec.

Here's what I did:

(The following registry keys may or may not exist...create or edit them...also keep in mind that you can play with the values, however don't increase the sizes so much that they overload the Processor with heavy I/O loads.)

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters]

"DefaultSendWindow"=dword:00100a40

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters]

"TcpWindowSize"=dword:00100a40

"GlobalMaxTcpWindowSize"=dword:00100a40

"Tcp1323Opts"=dword:00000003

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters]

"MaxBytesPerSend"=dword:000fffff

-Brian Grabowski