Lag from filetype plugin indent on

Question

I'm getting lag in vim when navigating relatively small text files if filetype plugin indent on is uncommented in my vimrc file. My full vimrc file is pasted below. Any help on how I can get it enabled properly with no lag? It's worked fine in the past. I only started having this issue lately.

set nocompatible          " We're running Vim, not Vi!
syntax on                 " Enable syntax highlighting

filetype off          " Begin For Vundle
set rtp+=~/.vim/vundle.git/
call vundle#rc()
Bundle 'gmarik/vundle'    
Bundle 'scrooloose/nerdcommenter'
Bundle 'scrooloose/nerdtree'

Bundle "https://github.com/msanders/snipmate.vim"
" End Vundle code

" causing massive lag, disabled
"filetype plugin indent on " Enable filetype-specific indenting and plugins

set number "enable line numbers
set lines=40 columns=100

set clipboard=unnamedplus

" Map ctrl-n to NerdTree
nmap <silent> <c-n> :NERDTreeToggle<CR>

" go to previous file with ,p
let mapleader = "," 
map <Leader>p <C-^> 

" Load matchit (% to bounce from do to end, etc.)
runtime! macros/matchit.vim

augroup myfiletypes
" Clear old autocmds in group
autocmd!
" autoindent with two spaces, always expand tabs
set ai sw=2 sts=2 et

" Move swp files to ~/.vim/tmp
set backupdir=~/.vim/tmp
set directory=~/.vim/tmp

Answer 1

Most likely you have something in your actual syntax files causing the lag. I'd reccomend running :syntime on, moving about a little, then doing :syntime report. This'll show you what patterns take the longest to check for matches. Consider disabling those, or looking them over if they're custom (usually stored in ~/.vim/after/)

Answer 2

I think my issue was related to https://github.com/vim/vim/issues/1098 I've updated to vim 8.0 and it seems to have fixed it.