[help][samsung s5][754 ram][china model]

[SnickerMKD]

Hello guys,
I have bought chinese model S5 and he has 4.4.2 Android version and its too slow for that Android version..
He has approximately 750.. RAM and can't work correct with this ROM .. Now i want to ask you has any CUSTOM ROM which can reduce lag,slow etc. On this piece od ****?
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RAM: 754 MB
Model: SM-G900H
Android version: 4.4.2
Software version: V78.09
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Pls Help.

Thanks,
Сникер
Snicker