Bench marks really mean nothing for real world usage, the KitKat update made the benchmarks go down, if you really want a better benchmark go back to stable version 4.3 it will be better.
I'm on the newst Dev ROM and mine has no lag whatsoever, maybe try that?
no, yesterday i perfomed a full wipe data, cache and no help... how can i contact you? u got facebook or xfire? viber? whatsapp? i really want to get my faster mi3
i tryed to update on 3 ways. Fastboot ( got error 0xffffffff ), via updater ( crashes and returns me to home screen ) and with Mi-recovery ( got message-failed to update )
and i cant install cwm, when i flash cwm with update.zip i got succesfull info but later i press volume+ and power button and enter again in Mi recovery...
I am getting out of sugestions...the only thing: did you got the right rom? I had never a problem with update..maybe you can flash a rom with mi recovery.
I don' know if you can update from android 4.3(yours) to the newest rom ( is 4.4) i am stuk on 4.3 because 4.4 has a vpn problem.maybe you can find a topic on this forum about that. Sorry i can't help more..