How to see which plugins are making Vim slow?

Question

Is there a way to profile Vim plugins?

My MacVim becomes slower and slower when I open a large .py. I know I could deselect all plugins and reselect one by one to check which plugin is the culprit, but is there a faster way?

My dotvim is here: https://github.com/charlax/dotvim

Answer 1

You can use built-in profiling support: after launching vim do

:profile start profile.log :profile func * :profile file * " At this point do slow actions :profile pause :noautocmd qall! 

(unlike quitting noautocmd is not really required, it just makes vim quit faster).

Note: you won’t get information about functions there were deleted before vim quit.

Answer 2

I found another very helpful vim buildin method to show the exactly timing messages while loading your .vimrc.

vim --startuptime timeCost.txt timeCost.txt 

Please run:

:help --startuptime 

in VIM to get more information.