Slow keyboard response when Trackpad connected
I use Apple Bluetooth Keyboard (bought 2011). Sometimes I also use Apple Bluetooth Trackpad (bought 2011). Whenever I connect the trackpad, the response from the keyboard becomes very slow. When I type something on my keyboard, while trackpad is connected, it takes 3 seconds for each letter to appear. Any suggestions?
MacBook Pro (Retina, 15-inch, Late 2013), OS X El Capitan (10.11.6)