Cost vs return - aka worthiness debate

[artag]

since we are talking about decent space gains vs reasonable compression time:

Using 7zip in replace of internal compression, gives me a good decompression time, because
how it handles uncompressable blocks. Also, it gives me some times better compression than
internal LZMA (because it does not add overhead to uncompressable blocks, try with mkv/mp4 file
and you'll see).

To all the experienced users: what switches do you use for improving compression
time to sane levels (and lose some mb but stay practicall).

I'm talking about internal LZMA and 7zip LZMA.

Also, any advice for a (stable and tested) substitute to lzma(2)?

oodle?
the new lolz?


thanks