git submodule update is slow. How can I debug why it's slow?

Question

I'm using git submodule and git submodule update --init --recursive command is slow (8 sec) although there seems no changes to be updated.

I want to debug why it's slow but it seems there is no --verbose switch. Any idea to debug what it's doing?

I'm running Ubuntu 14.04 and Git 1.9.

Answer 1

Since there is no change to actually checkout and copy, that leaves two main root causes:

• the url of the submodule is slow to respond
• or git submodule update was optimized since the old git 1.9: see if the issue persists with the latest git 2.6.4 found in the launchpad ppa