Next update will have two new features, database and stream deduplication and here are some benchmarks as to what these features can do.
Input is
Need for Speed Hot Pursuit\SEACREST
pzlib v2
Compressed 225 files, 3,253,110,016 => 859,932,872 bytes. Ratio 26.43%
Compression time: cpu 5.73 sec/real 300.50 sec = 2%. Speed 10.83 mB/s
pzlib v3
fails, no idea why
xtool2018 (v012)
Compressed 225 files, 3,253,110,016 => 722,889,785 bytes. Ratio 22.22%
Compression time: cpu 5.06 sec/real 188.09 sec = 3%. Speed 17.30 mB/s
xtool2019 (1908_R6)
Compressed 225 files, 3,253,110,016 => 722,934,572 bytes. Ratio 22.22%
Compression time: cpu 4.89 sec/real 189.14 sec = 3%. Speed 17.20 mB/s
xtool2020
Compressed 225 files, 3,253,110,016 => 722,927,890 bytes. Ratio 22.22%
Compression time: cpu 4.86 sec/real 165.26 sec = 3%. Speed 19.68 mB/s
xtool2020 with deduplication
Compressed 225 files, 3,253,110,016 => 719,194,176 bytes. Ratio 22.11%
Compression time: cpu 4.08 sec/real 154.45 sec = 3%. Speed 21.06 mB/s
xtool2020 with deduplication + memory database
Compressed 225 files, 3,253,110,016 => 719,195,766 bytes. Ratio 22.11%
Compression time: cpu 4.20 sec/real 75.00 sec = 6%. Speed 43.38 mB/s
xtool2020 with deduplication + imported database
Compressed 225 files, 3,253,110,016 => 719,194,905 bytes. Ratio 22.11%
Compression time: cpu 4.50 sec/real 61.77 sec = 7%. Speed 52.66 mB/s
precomp 
Compressed 225 files, 3,253,110,016 => 754,538,183 bytes. Ratio 23.19%
Compression time: cpu 6.69 sec/real 547.05 sec = 1%. Speed 5.95 mB/s
In precomp's defence, it uses disk instead of memory to work and stream type was never narrowed to only focus on deflate streams.
All tests ran using 4 threads with 32mb chunk size
NOTE: This input has repeated streams, some games have similar characteristics therefore xtool stores a database in memory to remember the configuration and then removes these repeated streams to give more speed.
It's free speed, there is no penalty in performance if you use the new options at all times however, some tests need to be run due to the possibility of collisions in the dictionary used...
This project has come a long way
