[shazzla]

Interesting...

[External compressor:lzna]
header = 0
packcmd = oodlemt.exe e -m7 {options} - -

arc a -mlzna:c128:l7:t4 pack.arc data.dat

uses only basic(?) thread ,while running oodlemt.exe from command line t4 works fine.
any idea ?
(i5-6600)

Edit :

[External compressorodle]
header = 0
packcmd = oodlemt.exe e {options} - -

arc a -moodle:c128:m7:l7:t4 pack.arc data.dat

it works !
strange....