It sounds like your device is struggling to parse incoming data efficiently. This could be due to low memory, faulty drivers, poor CPU or any number of things, I'm afraid.
The only things I can suggest off the top of my head are:
1. Try freeing up more memory
2. Fully power down your device, leave it for a minute, then turn it back on again
3. If you're on PC, shut down all high-RAM-usage programs (such as Chrome)
Sorry I can't be more help!