More ram is better but even on my 12.9" iPP Safari tabs reload at times, especially if I have an open tab that I haven't used in a while. And sometimes I have to close and reload Safari because the content doesn't render as fast as I'm scrolling. I've found that pressing the sleep wake button to get to the power off screen and then long pressing the home button until the screen refreshes frees up some memory but it definitely causes all Safari tabs to re-load.