Snapchat used to work lag free on my device. Now it lags so much that it takes over a minute to launch the app, take & send 1 pic. Might not be the app's faul

Snapchat used to work lag free on my device. Now it lags so much that it takes over a minute to launch the app, take & send 1 pic. Might not be the app's fault, but that's the reason i don't use it much