Horrendous lags and subpar performance

Hey all,

I had the s7e for a few months now.
On a fresh rom the phone flies after a few month everything starts lagging, late response of the touchscreen and typing lags are undeniable.

What am I doing wrong?

I'm using super man rom. Also tried different Roms and kernels with the same result. Can't get satisfactory performance overall.

As soon as I install my 50 apps it starts lagging.

Thanks

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