LOSSLESS PNG COMPRESSION BENCHMARKS

This is a place where I'll store various benchmarks on lossless PNG compression. While I'm normally okay with stripping metadata chunks on a case-by-case basis in my archiving, these tests are going to revolve around purely lossless compression when possible.
If you're interested in visually lossless (transparency-lossy) compression, another really good benchmark resource (by the author of pingo) can be found here.

MY BUILD

Intel i7-6850k 4.3MHz
ZOTAC GTX 980ti AMP! Extreme
32GB DDR4 RAM

Tested using PowerShell's Measure-Command{}

COMPRESSORS & PARAMETERS

advdef (2.1)

-z -4 -i 25 -f (IMAGE)

advpng (2.1)

-z -4 -i 25 -f (IMAGE)

DeflOpt (2.07)

-b/d/k/f (IMAGE)

ECT (0.8.2)

-9 --strict -keep --mt-deflate=12 (IMAGE)

ECT Genetic (0.8.2)

-9 --strict -keep --allfilters-b --mt-deflate=12 (IMAGE)

OptiPNG (0.7.7)

-o7 -preserve (IMAGE)

oxipng (2.1.6)

(IMAGE) --zopfli --threads 12 --interlace 0 --keep=tRNS,gAMA,cHRM,sRGB,iCCP,acTL,fcTL,fdAT,tEXt,zTXt,iTXt,bKGD,pHYs,sCAL,sBIT,sPLT,hIST,tIME,sTER,oFFs,vpAg --preserve

pingo (0.98.41)

-lossless -s9 -multiblocks=12 -nodate -nostrip (IMAGE)

pngcrush (1.8.11)

-ow -brute -reduce -save (IMAGE)

PngOptimizerCL (2.5)

-file:"(IMAGE)" -KeepFileDate -KeepBackgroundColor:K -KeepTextualData:K -KeepFrameControl:K -KeepPhysicalPixelDimensions:K

PNGOUT (Feb 13 2015)

(IMAGE) (IMAGE) /k1 /kp /kt /y

pngquant (2.12.2)

-o (IMAGE) --ext=.png --force --speed=1 --quality=100-100 -- (IMAGE)

pngwolf (1.1.2)

--in=(IMAGE) --out=(IMAGE) --max-evaluations=1 --estimator=libdeflate,level=12 --out-deflate=zopfli,iter=25

TruePNG (0.6.2.5)

/o3 /i0 /g2 /md keep all /t /tz /y (IMAGE)

ZopfliPNG

-m -y --iterations=25 --filters=0meb --keepchunks=tRNS,gAMA,cHRM,sRGB,iCCP,acTL,fcTL,fdAT,tEXt,zTXt,iTXt,bKGD,pHYs,sCAL,sBIT,sPLT,hIST,tIME,sTER,oFFs,vpAg (IMAGE) (IMAGE)

IMAGE #1

Digital drawing from my friend Kriztian of one of his characters, Aristora.

Medium color amount, flat background, some repeated sections

RESULTS

Compressor Size (Bytes) Size Time spent (Milliseconds) Time spent Data lost?
Original 11343729 10.8 MB
advdef 844251 824 KB 96949.279 1 Minute 36.949 Seconds No
advpng 844230 824 KB 98407.883 1 Minute 38.883 Seconds Yes (pHYs)
DeflOpt 11343729 10.8 MB 84.426 0.084 Seconds No (Fail)
ECT 844026 824 KB 9122.414 9.122 Seconds No
ECT-Genetic 829209 809 KB 2656984.77 44 Minutes 16.984 Seconds No
OptiPNG 866588 846 KB 34177.677 34.177 Seconds No
oxipng 844679 824 KB 311248.997 5 Minutes 11.248 Seconds No
pingo 844045 824 KB 2681.3732 2.681 Seconds No
pngcrush test test test test test
PngOptimizerCL test test test test test
PNGOUT test test test test test
pngquant test test test test test
pngwolf test test test test test
TruePNG test test test test test
ZopfliPNG test test test test test

Time