Session storage

Hello, i need to move session storage, because my environment has blocked access to default php session storage (files). I need to move session data into memcache. Any help how can it be done? I tried php ini_set('session.save_handler', 'memcache'), it does the job and i can see session data in memcache, but it is really slow and page load time is 500ms and greater. Any help appreciated. Thanks

Currently this is not configurable. Can you create an issue here: https://github.com/getgrav/grav/issues and request this???