Over time the memory resources used by some web browsers can cause slow operation. Try restarting your computer to clear the memory and logging in to PebblePad again to see if this improves the situation. Ensure no background applications or downloads are running as this will consume CPU resources and internet bandwidth. Also check that you have the latest updates available for your browser. Alternatively it could be that the PebblePad server at this particular time is extremely busy, especially during specific deadline times/dates.