I have issue

[SM229]

My mobile speed slow 

How to speed up

Galaxy j7

[Ehsank]

Try these steps and observe

A. Wipe Cache Partition.
Steps to perform.
1) Turn off the device.

(Connect with type C cable/type C earphone only for Android 11)
OR
IF YOU HAVE ANOTHER MOBILE THEN CONNECT WITH CABLE WHETHER IT IS TYPE C TO TYPE C OR MICRO USB PORT take help of otg connector to connect other mobile.
2) Press and hold the Volume Up key and the spower button.
3) When the Android logo displays, release all keys.
4) Press the Volume down key to navigate and select "Wipe cache partition".
5) Press Power key to select. When the wipe cache partition is complete, Select Reboot System.
6) Press the Power key to restart the device.

And if still same issue persist then try these below steps;

B. go to settings >>advance features >>enable reduce animation .

C. go to developer option and disable or decrease animation scale to. 5x
it may useful for you.

If you not yet enable developer option then follow these steps

Steps to enable developer option
settings >about phone>software information >then u find build number >tap 7 times>then back to settings
and at end of settings one new option called developer option
click on it and find that option

[Samsung_Support1]

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device hanging issue please visit this link: https://www.samsung.com/in/support/mobile-devices/how-to-restart-the-device-when-freezed-or-hanged/

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support