Any particular reason you use HtmlPurifier twice during rebuild

[TSP]

When the legacyParser rebuilds earlier posts half of the time is spent by HtmlPurifier in two calls that are made in system/Text/parser.php. 

Any particular issues that've caused you to do this? 

Do you consider both calls really necessary?

	public function parse( $value )
	{
		/* HTMLPurifier - remove bad stuff and make sure HTML is well formed */
		if ( $this->htmlPurifier !== NULL )
		{
			$value = $this->htmlPurifier->purify( $value );
		}
		...
		/* HTMLPurifier again, to catch anything bad from bbcodes */
		if ( $this->htmlPurifier !== NULL )
		{
			$value = $this->htmlPurifier->purify( $value );
		}

 

[TSP]

Any comments on this? It spends at least half the rebuild time on running the two instances of HTMLPurifier::purify(). Maybe there is a point in one of them, but it still seems weird to have it be two times.