You might try running cperl-find-pods-heres. Finding POD is supposedly expensive, so cperl avoids doing so to keep editing responsive. I have this bound to C-c C-f in cperl-mode to fix things up:

(defun my-perl-refontify ()
  (interactive)
  (cperl-find-pods-heres)
  (font-lock-fontify-buffer))
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