If it feels `git clone` is throttled on Windows...

Try changing automated packet size selection

Symptoms of the problem

  • Internet connection is fast and a torrent download of Ubuntu can go at 10MB/s, but git clone gets ‘stuck’ at 500-600KB/s.
  • Connecting through VPN helps a bit sometimes, increasing the speed, but not to it's full potential.
  • Another computer using the same network (wired or wireless) gets full download speed when cloning, so you know it's not the connection at fault.
netsh interface tcp show global


Querying active state...

TCP Global Parameters
Receive-Side Scaling State          : disabled
Receive Window Auto-Tuning Level    : disabled
Add-On Congestion Control Provider  : default
ECN Capability                      : disabled
RFC 1323 Timestamps                 : disabled
Initial RTO                         : 1000
Receive Segment Coalescing State    : enabled
Non Sack Rtt Resiliency             : disabled
Max SYN Retransmissions             : 4
Fast Open                           : enabled
Fast Open Fallback                  : enabled
HyStart                             : enabled
Proportional Rate Reduction         : enabled
Pacing Profile                      : off

The problem is this line: Receive Window Auto-Tuning Level : disabled.


Change Receive Window Auto-Tuning Level to normal (from elevated cmd/powershell):

netsh int tcp set global autotuninglevel=normal

After this my git clone speeds went up to the bandwidth of my internet connection.

Dmitry Avtonomov
Software Engineer

My main research interests are data visualization and processing for mass spectrometry.