How to get most of lolz parallelism

[Simorq]

RZ 1600

Creating archive: VC4.Bin.001 using rep+srep:m3f:l512+lolz:dtb1:d32:mtt1:mt10:mc1023+diskspan:4410mb:4430mb
Compressed 25 files, 64,396,399,216 => 4,624,220,180 bytes. Ratio 7.18%    
Compression time: cpu 3093.48 sec/real 17804.47 sec = 17%. Speed 3.62 mB/s
All OK

Creating archive: VC4.Bin.001 using rep+srep:m3f:l512:m512+lolz:dtb1:d32:mtt1:mt6:mc1023+diskspan:4360mb:4430mb
Compressed 26 files, 64,248,717,854 => 4,571,791,380 bytes. Ratio 7.12%    
Compression time: cpu 2337.45 sec/real 17213.25 sec = 14%. Speed 3.73 mB/s
All OK

I think Lolz does not work with virtual cores.