What is "active unoptimized" Group State?

Hi, all

I want to understand "Group State : active unoptimized".

But I can not see an explanation on CLI manual.

[FYI]

It state can see "esxcli storage nmp path list" command.

fc.20140030130f4101:20040030130f4101-fc.50060160c720063b:5006016b4720063b-naa.600601601b502e00cce7e553fcebe111:
   Runtime Name: vmhba2:C0:T5:L101
   Device: naa.600601601b502e00cce7e553fcebe111
   Device Display Name: DGC Fibre Channel Disk (naa.600601601b502e00cce7e553fcebe111)
   Group State: active unoptimized <-----Here!!!!!
   Array Priority: 0
   Storage Array Type Path Config: {TPG_id=2,TPG_state=ANO,RTP_id=16,RTP_health=UP}
   Path Selection Policy Path Config: {current: no; preferred: no}

Thanks