whats is the best firmware to used on a mxq_dz box

• whats is the best firmware to used on a mxq_dz box for speed and needs to be stable
  the reason i ask is because my box seams laggy and jerky compared to my other android devices
  
  current
  amlogic 805
  android 4.4.2
  kernel 3.10.33
  build kot49h.20150803.v0823 test-keys

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