I have some shortcuts for LaTeX in ./vim/after/latex.vim but when I open a LaTeX file, this shortcuts are not available, and I need to load the file manually. I guess this is related to the Latex-vim plugin. How can I set these shortcuts to be loaded automatically? 
When are the files in ~.vim/after/ loaded?
vimrc;startup
Add them into ~/.vim/after/ftplugin/tex/. :h 'rtp' IIRC and :h ftplugin