question

I have a Samsung Galaxy S5 and the latest version of the mobile App.  Most of my communication with employees is via text--probably 50-100 texts per day on average.  The app makes working away from the office excruciating. On most occasions it takes an average of 60-90 seconds to open the app.  Another 60-90 seconds to open a specific text, another 60-90 to reply, another 60-90 to go back to the main menu.  It's the same whether on wifi or 4g.  I've done what I can to shut down other programs, make sure Ring Central is the only thing running, etc.    Going to get another phone--my wife has an LG Stylo and it's still very laggy but not as bad.  Are others experiencing this and if so what can I do to improve it. I have enjoyed Ring Central so far, but this is important enough that I've considered going elsewhere for service.