yeah roms are mostly performance/aesthetics; she won't benefit from any.
^ makhaira, apparently some init.d tweaks can help/cause instability, as can using different governors (i found ondemand to be great, tho). also, don't turn on any of the memory tweaks in performance options, apparently they can make it go mental too.
also let me know if you get bootloops when charging - that's when i get all mine