A: LineageOS 14.1 (Android 7.1) is the fastest. Newer Android versions add overhead.
The custom ROM community for the J5 2015 is one of the most dedicated on XDA. Thanks to developers like Vince2678 , dariotr , and Option58 , a phone that Samsung abandoned in 2017 can still be useful in 2025. samsung galaxy j5 2015 custom rom
Before installing a custom ROM on your Samsung Galaxy J5 (2015), make sure you: A: LineageOS 14