I see the same problem, after some profiling with xdebug I see that a strange problem occur with PHP/APC, all the framework is excluded from APC opcode cache in 1.0.7
APC stats for 1.0.7:
<hidden>/index.php 500 7892 2009/07/13 03:27:21 2009/07/13 00:23:53 2009/07/13 03:23:09
<hidden>/SiteController.php 500 12404 2009/07/13 03:27:21 2009/07/13 02:47:26 2009/07/13 03:23:09
<hidden>/main.php 500 2573 2009/07/13 03:27:21 2009/07/13 00:23:53 2009/07/13 03:23:09
<hidden>/index.php 500 2106 2009/07/13 03:27:21 2009/07/13 02:46:27 2009/07/13 03:23:09
<hidden>/main.php 499 6891 2009/07/13 03:27:21 2009/07/13 00:23:53 2009/07/13 03:23:09
<hidden>/mainMenu.php 499 2559 2009/07/13 03:27:21 2009/07/13 00:23:53 2009/07/13 03:23:09
<hidden>/MainMenu.php 499 13916 2009/07/13 03:27:21 2009/07/13 00:23:53 2009/07/13 03:23:09
<hidden>/YiiBase.php 499 89351 2009/07/13 03:27:21 2009/07/13 03:23:01 2009/07/13 03:23:09
APC stat with 1.0.5 :
<hidden>/index.php 499 7892 2009/07/13 03:28:22 2009/07/13 00:23:53 2009/07/13 03:28:21
<hidden>/main.php 499 6891 2009/07/13 03:28:22 2009/07/13 00:23:53 2009/07/13 03:28:21
<hidden>/SiteController.php 499 12404 2009/07/13 03:28:22 2009/07/13 02:47:26 2009/07/13 03:28:21
<hidden>/main.php 499 2573 2009/07/13 03:28:22 2009/07/13 00:23:53 2009/07/13 03:28:21
<hidden>/index.php 499 2106 2009/07/13 03:28:22 2009/07/13 02:46:27 2009/07/13 03:28:21
<hidden>/yii.php 499 2053 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CClientScript.php 499 90424 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CLogRouter.php 499 11012 2009/07/13 03:28:22 2008/05/03 04:09:32 2009/07/13 03:28:21
<hidden>/CLogRoute.php 499 8420 2009/07/13 03:28:22 2008/05/03 04:09:32 2009/07/13 03:28:21
<hidden>/CFileLogRoute.php 499 21930 2009/07/13 03:28:22 2008/05/03 04:09:32 2009/07/13 03:28:21
<hidden>/interfaces.php 499 56680 2009/07/13 03:28:22 2008/05/03 04:09:41 2009/07/13 03:28:21
<hidden>/CApplicationComponent.php 499 4890 2009/07/13 03:28:22 2008/05/03 04:09:41 2009/07/13 03:28:21
<hidden>/YiiBase.php 499 83579 2009/07/13 03:28:22 2009/07/13 03:22:48 2009/07/13 03:28:21
<hidden>/MainMenu.php 498 13916 2009/07/13 03:28:22 2009/07/13 00:23:53 2009/07/13 03:28:21
<hidden>/CWidget.php 498 22994 2009/07/13 03:28:22 2008/05/03 04:09:43 2009/07/13 03:28:21
<hidden>/CHtml.php 498 267797 2009/07/13 03:28:22 2008/05/03 04:09:43 2009/07/13 03:28:21
<hidden>/CWebUser.php 498 77572 2009/07/13 03:28:22 2008/05/03 04:09:42 2009/07/13 03:28:21
<hidden>/CInlineAction.php 498 2981 2009/07/13 03:28:22 2008/05/03 04:09:42 2009/07/13 03:28:21
<hidden>/CAction.php 498 4798 2009/07/13 03:28:22 2008/05/03 04:09:42 2009/07/13 03:28:21
<hidden>/CWebApplication.php 498 78402 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CUrlManager.php 498 84208 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CHttpSession.php 498 55111 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CHttpRequest.php 498 119575 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CController.php 498 142264 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CBaseController.php 498 30930 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CLogger.php 498 24170 2009/07/13 03:28:22 2008/05/03 04:09:32 2009/07/13 03:28:21
<hidden>/CMap.php 498 39042 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CListIterator.php 498 7663 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CList.php 498 43166 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CAttributeCollection.php 498 21014 2009/07/13 03:28:22 2008/05/03 04:09:45 2009/07/13 03:28:21
<hidden>/CComponent.php 498 78588 2009/07/13 03:28:22 2008/05/03 04:09:41 2009/07/13 03:28:21
<hidden>/CApplication.php 498 84704 2009/07/13 03:28:22 2008/05/03 04:09:41 2009/07/13 03:28:21
<hidden>/mainMenu.php 497 2559 2009/07/13 03:28:22 2009/07/13 00:23:53 2009/07/13 03:28:21
<hidden>/CModule.php 496 61740 2009/07/13 03:28:22 2008/05/03 04:09:41 2009/07/13 03:28:21