Profiling Vim startup time

Question

I’ve got a lot of plugins enabled when using Vim – I have collected plugins over the years. I’m a bit fed up with how long Vim takes to start now, so I’d like to profile it

Answer 1

You can use vim own profiling mechanism:

vim --cmd 'profile start profile.log' \
    --cmd 'profile func *' \
    --cmd 'profile file *' \
    -c 'profdel func *' \
    -c 'profdel file *' \
    -c 'qa!'

After running the above you will find a file called profile.log in the current directory with all required information. To get per-script information table similar to already present per-function one, use (after opening this file in vim):

" Open profile.log file in vim first
let timings=[]                      
g/^SCRIPT/call add(timings, [getline('.')[len('SCRIPT  '):], matchstr(getline(line('.')+1), '^Sourced \zs\d\+')]+map(getline(line('.')+2, line('.')+3), 'matchstr(v:val, ''\d\+\.\d\+$'')'))
enew                            
call setline('.', ['count total (s)   self (s)  script']+map(copy(timings), 'printf("%5u %9s   %8s  %s", v:val[1], v:val[2], v:val[3], v:val[0])'))

It will be unsorted, but you can always use built-in :sort command if number of scripts is too large.