This version of Lessfs contains some minor bug fixes as well as something new. Although my previous post states that no new features would be added to the 1.x series this release actually does. Lessfs now supports the LZ4 compression algorithm. Adding support for new compression methods to lessfs is not much work at all and there have been a number of votes for adding LZ4 so it can be compared with Googles snappy compression.
I did not test LZ4 on high end hardware yet. However even on my laptop it is clear that LZ4 does outperform snappy. With the hardware being the bottleneck LZ4 still manages to speed things up by 2~5%. Most likely the difference will be larger when fast hardware is used. The system that I use for performance testing has Berkeley DB stored on SSD and the data on a fast raid5 array containing 8 SATA drives.
I will post the exact performance numbers on low and high end hardware after testing has finished.