diff --git a/core/autocommands.vim b/core/autocommands.vim
index c055c49..70b40db 100644
--- a/core/autocommands.vim
+++ b/core/autocommands.vim
@@ -135,3 +135,23 @@ augroup auto_create_dir
   autocmd!
   autocmd BufWritePre * lua require('utils').may_create_dir()
 augroup END
+
+" ref: https://vi.stackexchange.com/a/169/15292
+function! s:handle_large_file() abort
+  let g:large_file = 10485760 " 10MB
+  let f = expand("<afile>")
+
+  if getfsize(f) > g:large_file || getfsize(f) == -2
+    set eventignore+=all
+    " turning off relative number helps a lot
+    set norelativenumber
+    setlocal noswapfile bufhidden=unload buftype=nowrite undolevels=-1
+  else
+    set eventignore-=all relativenumber
+  endif
+endfunction
+
+augroup LargeFile
+  autocmd!
+  autocmd BufReadPre * call s:handle_large_file()
+augroup END