Slow, intermittent dashboards

I am experiencing slow response and intermittent response on my dashboards especially the Virtual Keypad on my Fire Tablet. I have two dashboards: a Virtual Keypad on a Fire Table set as a local LAN with a 1 second refresh rate and a dashboard used on two cell phones (one Samsung Android and one Iphone) set as a cloud link with 5 second refresh rate. Sometimes I have to touch a button several times to get it to accept the touch. When it does accept the touch, it takes several seconds to respond. Any suggestions? Thanks.