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Big files in vim

Handling of big files, proposed solution by William Natter, Tony Mechelynck and others 
let g:SaveUndoLevels = &undolevels
let g:BufSizeThreshold = 1000000
if has("autocmd")
    au VimEnter * let g:SaveUndoLevels = &undolevels
    au BufReadPre * if getfsize(expand("%")) >= g:BufSizeThreshold | setlocal noswapfile | endif
    au BufEnter * if getfsize(expand("%")) < g:BufSizeThreshold | let &undolevels=g:SaveUndoLevels | else | setlocal undolevels=-1 | endif
endif
Syntax should also be turned off.