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-rw-r--r--   1 root     root        4.4G Jun  4 14:10 letsencrypt1
-rw-r--r--   1 root     root        4.4G Jun  4 14:10 letsencrypt2


[root@host /opt]# time pbzip2 letsencrypt1
real	1m47.420s
user	40m21.814s
sys	0m11.925s


[root@host /opt]# time gzip letsencrypt2 
real	5m56.621s
user	5m51.866s
sys	0m4.760s


-rw-r--r--   1 root     root        1.2G Jun  4 13:57 letsencrypt1.bz2
-rw-r--r--   1 root     root        1.3G Jun  4 14:10 letsencrypt2.gz