Previously the fastest Oodle encode level was "SuperFast" (level 1). The new "HyperFast" levels are below that (level -1 to -4). The HyperFast levels sacrifice some compression ratio to maximize encode speed.

An example of the performance of the new levels (on lzt99, x64, Core i7-3770) :

In the loglog plot, up = higher compression ratio, right = faster encode.

lzt99 : Kraken-z-3 : 1.711 to 1 : 416.89 MB/s lzt99 : Kraken-z-2 : 1.877 to 1 : 333.28 MB/s lzt99 : Kraken-z-1 : 2.103 to 1 : 280.09 MB/s lzt99 : Kraken-z1 : 2.268 to 1 : 167.01 MB/s lzt99 : Kraken-z2 : 2.320 to 1 : 120.39 MB/s lzt99 : Kraken-z3 : 2.390 to 1 : 38.85 MB/s lzt99 : Kraken-z4 : 2.434 to 1 : 24.98 MB/s lzt99 : Mermaid-z-3 : 1.660 to 1 : 438.89 MB/s lzt99 : Mermaid-z-2 : 1.793 to 1 : 353.82 MB/s lzt99 : Mermaid-z-1 : 2.011 to 1 : 277.35 MB/s lzt99 : Mermaid-z1 : 2.041 to 1 : 261.38 MB/s lzt99 : Mermaid-z2 : 2.118 to 1 : 172.77 MB/s lzt99 : Mermaid-z3 : 2.194 to 1 : 97.11 MB/s lzt99 : Mermaid-z4 : 2.207 to 1 : 40.88 MB/s lzt99 : Selkie-z-3 : 1.447 to 1 : 627.76 MB/s lzt99 : Selkie-z-2 : 1.526 to 1 : 466.57 MB/s lzt99 : Selkie-z-1 : 1.678 to 1 : 370.34 MB/s lzt99 : Selkie-z1 : 1.698 to 1 : 340.68 MB/s lzt99 : Selkie-z2 : 1.748 to 1 : 204.76 MB/s lzt99 : Selkie-z3 : 1.833 to 1 : 107.29 MB/s lzt99 : Selkie-z4 : 1.863 to 1 : 43.65 MB/s

A quick guide to the Oodle CompressionLevels :

-4 to -1 : HyperFast levels when you want maximum encode speed these sacrifice compression ratio for encode time 0 : no compression (memcpy pass through) 1 to 4 : SuperFast, VeryFast, Fast, Normal these are the "normal" compression levels encode times are ballpark comparable to zlib 5 to 8 : optimal levels increasing compression ratio & encode time levels above 6 can be slow to encode these are useful for distribution, when you want the best possible bitstreamNote that the CompressionLevel is a dial for encode speed vs. compression ratio. It does not have a consistent correlation to decode speed. That is, all of these compression levels get roughly the same excellent decode speed.

Comparing to Oodle 2.6.0 on Silesia :

Oodle 2.6.0 : Kraken 1 "SuperFast" : 3.12:1 , 147.2 enc MB/s , 920.9 dec MB/s Kraken 2 "VeryFast" : 3.26:1 , 107.8 enc MB/s , 945.0 dec MB/s Kraken 3 "Fast" : 3.50:1 , 47.1 enc MB/s , 1043.3 dec MB/s Oodle 2.6.3 : Kraken -2 "HyperFast2" : 2.92:1 , 300.4 enc MB/s , 1092.5 dec MB/s Kraken -1 "HyperFast1" : 3.08:1 , 231.3 enc MB/s , 996.2 dec MB/s Kraken 1 "SuperFast" : 3.29:1 , 164.6 enc MB/s , 885.0 dec MB/s Kraken 2 "VeryFast" : 3.40:1 , 109.5 enc MB/s , 967.3 dec MB/s Kraken 3 "Fast" : 3.61:1 , 45.8 enc MB/s , 987.5 dec MB/sNote that in Oodle 2.6.3 the normal levels (1-3) have also improved (much higher compression ratios).