Problem when saving my vimfile

Hi,

Each time that I open a new vimfile of my own or another existing one,
the saving action (:w!) takes more and more time after each new saving
command.

I suppose it comes from autocommand written in my _vimrc.
Thank you for helping,
Let see:

" Only do this part when compiled with support for autocommands. {{{1
if has("autocmd")
autocmd bufwritepost ~/_vimrc source $MYVIMRC
autocmd bufwritepost ~/vimfiles/plugin/utilsNiva.vim source ~/
vimfiles/plugin/utilsNiva.vim
autocmd bufwritepost ~/vimfiles/plugin/ren.vim source ~/vimfiles/
plugin/ren.vim
autocmd BufNewFile,BufRead,BufWrite,FileType c,cpp set fdm=marker
" Enable file type detection.
" Use the default filetype settings, so that mail gets 'tw' set to
72,
" 'cindent' is on in C files, etc.
" Also load indent files, to automatically do language-dependent
indenting.
filetype plugin indent on
" Put these in an autocmd group, so that we can delete them easily.
augroup vimrcEx
au!
" For all text files set 'textwidth' to 78 characters.
autocmd FileType text setlocal textwidth=90
" When editing a file, always jump to the last known cursor
position.
" Don't do it when the position is invalid or when inside an event
handler
" (happens when dropping a file on gvim).
autocmd BufReadPost *
\ if line("'\"") > 0 && line("'\"") <= line("$") |
\ exe "normal! g`\"" |
\ endif
augroup END
else
endif " has("autocmd")

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