Check the screenshot for the reference.

The total size of the update is 130MB and as per the screenshot this update is not only limited to security patch .

This update brings some major improvements in the Performance and fixes the keyboard lagging issue

and also improves the system stability .

Even in the camera department we can see some improvement , as per the update log HDR effect and white balance performance has been improved.

And finally the Wi-Fi performance and network stability has been improved in the update