Slow browsing but global up/down well under tested speeds

Like the tread says my internet browsing is slow even though I’ve got the global upload and downloads padded (download 400 out of possible 625 and upload 30/45). And my downloads are well underthe global (currently 38).

What obvious thing am I missing?

Lower your global maximum upload rate until your browsing returns to something like normal. You may have to experiment with several levels until you find a good compromise.