Doctrine_Core::loadModels() caching

Add ability to cache result of Doctrine_Core::loadModels().
My "models" folder contains more than 20 record classes plus more than 20 base classes. I added result caching for conservative model loading and it's reduced application bootstrap time more than 100ms.
Here code that I added to Doctrine_Core::loadModels()
Cache hit check at the beginning of the method

                $models = zend_shm_cache_fetch('doctrine::models_conservative');
                $modelPatch = zend_shm_cache_fetch('doctrine::models_conservative_paths');
                if(false !== $models && false !== $modelPatch){
                    self::$_loadedModelFiles = $modelPatch;
                    return $models;
                }

Result caching before return data

           asort($loadedModels);
            zend_shm_cache_store('doctrine::models_conservative',$loadedModels);
            zend_shm_cache_store('doctrine::models_conservative_paths',self::$_loadedModelFiles);
            return $loadedModels;

Of course zend_shm_cache_* is not proposed as caching solution.
I didn't use agressive model loading, but I think that caching for aggresive modlel loading can be done with compilation of all models to one file