Extract bz2 faster

Premise

Extraction times cannot be slower than download times

Tests & solution

The usual

time tar xjf blender-2.79-9800837b9879-linux-glibc224-x86_64.tar.bz2 
tar xjf blender-2.79-9800837b9879-linux-glibc224-x86_64.tar.bz2  24.68s user 1.62s system 105% cpu 24.835 total

After ‘apt install lbzip2’

time lbzip2 -d blender-2.79-9800837b9879-linux-glibc224-x86_64.tar.bz2 
lbzip2 -d blender-2.79-9800837b9879-linux-glibc224-x86_64.tar.bz2  34.29s user 1.09s system 788% cpu 4.487 total # + additional 0.5s to untar

Making tar to use lbzip2 for decompression

time tar -I lbzip2 -xvf blender-2.79-9800837b9879-linux-glibc224-x86_64.tar.bz2
...
34.53s user 1.96s system 774% cpu 4.709 total < # this.
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