Can someone explain why the compilation times are faster under Spirit2.1<br><br>I have noticed that even boost 1.39 references spirit qi,  can I assume that<br>faster compile times are due to moving from spirit classic to spirit qi ?<br>
<br>More importantly can we intermix classic and qi grammars, if not<br>are there any migration notes, to help users<br clear="all"><br>-- <br>   Best regards,<br>Ta,<br>    Avi<br><br>