I've seen a couple of posts previously here about speeding up Sony Bravia Android TVs by disabling YouView as well as the 'Featured Apps' and 'Sony Select' app. The trouble with doing this for us UK users is we lose access to iPlayer, All4, My5 and the ITV Hub and I haven't seen this addressed yet. The below links to a project on github who has fixed this by adding links to the above apps into the app tray so if you are in the UK, you can now disable all the Sony stuff and still catch up on Eastenders. Works on my xd8305.
https://github.com/hoshsadiq/bravia-youview-player-launchers
See https://www.reddit.com/r/bravia/comments/8mttbx/uk_bravia_android_tv_users_i_have_created_a/