vim launch time profiling

Recently, I found that it need quite some time to launch vim. I  googled a little bit and found that the following webpage is very useful.

http://usevim.com/2012/04/18/startuptime/

Basically, just two command, 

$ vim --startuptime vim.log (optional: file_you_want_to_open)

$ cat vim.log | sort -k 2 

I found that c.vim cost quite some time. Since I am programming in c++,

I still want to stay with it.