My device frequently lags, how can I make it smoother?

The methods as below can improve the fluency of the device:

①As the number of photos stored increase, storage space of the device will inevitably decrease. Please back up data termly, clear the unnecessary or duplicate photos to release storage space is effective to improve device fluency.

②Using the original or regular external memory card, or speed of reading and writing data will be affected.

③Keep system to the latest version. System upgrade improves system stability, and solve the compatibility problems on old version.