Do not perform Internal tags <-> storing tags conversion methods org.ametys.forms._onGetContent, org.ametys.forms._onSetContent, etc... when these methods are called by the character counter.
Indeed, the characters counter make useless repeated calls to these costly functions.

To do this, simply insert something like

if (object.from === 'char-counter') return;

at the top of those function body.

The issue is depends on : CMS-4151