Introduction

If you are finding that your Vista machine runs YAMJ very slow, try these changes (at your own risk) to see if they improve the speed.

Note: These changes affect the networking of your machine, and should be attempted with caution.

Thanks to forum user Sinyk for detailing these changes.

Details

From a command prompt run in administrator mode

C:\> netsh int tcp show global

This should display something similar to this:

TCP Global Parameters
------------------------------------------------
Receive-Side Scaling State          : enabled
Chimney Offload State               : disabled
Receive Window Auto-Tuning Level    : highlyrestricted
Add-On Congestion Control Provider  : none
ECN Capability                      : disabled
RFC 1323 Timestamps                 : enabled

Note: The above autotuninglevel setting is the result of Windows Scaling heuristics overriding any local/policy configuration.

So, we need to turn the heuristics off...

C:\> netsh int tcp set heuristics disabled

... That should do the trick, then:

C:\> netsh int tcp set global autotuninglevel=normal

Turns autotuning back to what it should be at. Now to turn ctcp on....

C:\> netsh int tcp set global congestionprovider=ctcp

We'll leave the rest as-is. So just to check it's all done...

C:\> netsh int tcp show global

Should display:

TCP Global Parameters
------------------------------------------------
Receive-Side Scaling State          : enabled
Chimney Offload State               : disabled
Receive Window Auto-Tuning Level    : disabled
Add-On Congestion Control Provider  : ctcp
ECN Capability                      : disabled
RFC 1323 Timestamps                 : enabled

You should now notice a vast improvement in YAMJ scanning speed