Found the slow places in LBG.

...azgracompress/compression/CompressorDecompressorBase.java

...ain/java/azgracompress/compression/VQImageCompressor.java

src/main/java/azgracompress/data/Chunk2D.java

src/main/java/azgracompress/data/V3i.java

...azgracompress/quantization/vector/LBGVectorQuantizer.java

src/main/java/azgracompress/utilities/Stopwatch.java