By Kirk Miller New baggage scanners being installed by the Transportation Security Administration offer up several advantages for passengers, but speeding through airport security isn’t one of them. As reported by the travel site The Points Guy, these new tomography checkpoint scanners (CT) provide 3-D imaging of bags and can mean that those without TSA PreCheck might not have to remove laptops or liquids from their bags. The downside, however, is that these machines are apparently very, very slow. As passenger Joelle Erickson noted in the article, a recent security line took an estimated 10 m…