You can try to execute jQuery script:
$('body').html($('body').html() .replace(/\/(?=[^>]*<)/gi, '<span style="color:red">/</span>'));
It simply wraps all slashes that are not inside tags with an interval.
Check how quickly this happens for your site, I believe that it can be useful.
Here is FIDDLE to demonstrate that using lookahead (?=[^>]*<) Is important to prevent matches within the <> tags for replacement, try removing it, and the resulting HTML will break.
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