Bloodhound's ultimate needs to be fixed. While you consider some over performing or under performing, this legend is totally broken. The dramatic FPS drop when using the ult is across all platforms.
Mentioned earlier, but yes - the performance drop of Bloodhound's ult should be getting addressed in a future patch. Can't promise it'll have NO performance impact, as there's a lot of rendering shenanigans going on, but it should be improved.