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The previous checkin (2.84) added a PyErr_Format call that made the cost of raising an AttributeError much more expensive. In general this doesn't matter, except that checks for __init__ and __del__ methods, where exceptions are caught and cleared in C, also got much more expensive. The fix is to split instance_getattr1 into two calls: instance_getattr2 checks the instance and the class for the attribute and returns it or returns NULL on error. It does not raise an exception. instance_getattr1 does rexec checks, then calls instance_getattr2. It raises an exception if instance_getattr2 returns NULL. PyInstance_New and instance_dealloc now call instance_getattr2 directly.