How to avoid autocmd CursorMoved to lag ?

Hi,

I use this func to switch filetype when cursor is moving outside/inside embed section:

fun! helper#SwitchFileType() "{{{
  if !exists('b:busy')
  let b:busy=1
let start = str2nr(search( '^\w\+\s\+<<\s\+EOF', 'n' ))
if start > 0
  let end    = str2nr(search( '^EOF', 'n' ))
  let curpos = getcurpos()[1]
  let lang   = split(getline(start), '<<')[0]->substitute('\s', '', "g") 
  if (curpos > start) && (curpos < end)
exe 'set ft='.lang
  else
exe 'set ft=vim'
  end
"echo 'Filetype switched to ' . &ft
end
  unlet b:busy
  end
endfun "}}}

  autocmd CursorMoved    *.vim   call helper#SwitchFileType()

  autocmd CursorMovedI   *.vim   call helper#SwitchFileType()

 

The func is called on event cursormoved and lag cursor effectively moving action.

how to avoid this lag ?

Thank you

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