This quick test will tell you if your home Wi-Fi is to blame for laggy internet

If you suspect something’s amiss with your home network, the first thing you might do is run ​a speed test from sites like speedtest.net or fast.com​—or even the newer Orb speed test tool featured here last May​. But those tests don’t tell the whole story, because they only check the speed of your internet connection. They won’t tell you how quickly data can actually move around your home—which is important if you’re troubleshooting Wi-Fi problems or figuring out what internet speeds your rou...