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Webster17,
Sorry but 4 GB ram means that you are low on "FREE" Ram, if you have around 2 ~ 2.2 GB ram free you cannot run most of the compressors with efficiency however i am willing to share some info on what to change at least to have some usability
1)change srep:m3f:a1 to srep:m2f:a1
2)change lzma2:d256m to lzma2:d50m
3)use zstd with level 19 and below
4)change lolz:d256m:mt2 to lolz:d64m:mt1
5) change pzlib:high:ct75p:st:1:c250m to pzlib:high:ct75p:st:1:c32m
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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