WEBP compression and levels

[Xn User]

Hi )
With this settings for WEBP I can not understand difference between of method 5 and method 6 , how many I try both method , file always same , and also size same from byte to byte , why so ? Method 6 not work ? Or method 6 work in some other preset and settings ?
At all there is no difference as set preset and method 5 or 6 , even filter strengh and filter sharpness not replace not work ) why so ?
And sometimes it happens like that on video
I can offer leave only method 5 and remove all others , because as I see , there is either no difference at all, or it is in not favor of the not method 6 , method 5 compress always better , if difference and have between method 5 and method 6 available so very very small in size but very very big in time )
methods 0-4 faster but very not effective ) difference in time not worth it )
In my opinion method 5 is best balance with speed and compress ratio , at least in lossless compression

[xnview]

in doc, 6=slowest

[Xn User]

But why this method compress worse ? This method accuracly need in your software ? On 100 files this method in 90 files create file bigger then method 5 , and 10 files will be smaller of method 5 ) and average file size will be bigger and compression worse than the method 5 in total method very strange and as I think , not needed )

[Xn User]

https://storage.googleapis.com/download ... ws-x64.zip

-z <int> ............... activates lossless preset with given
level in [0:fast, ..., 9:slowest]
0.webp 4 025 Kb 14.12.24 14:04 -a--
1.webp 3 965 Kb 14.12.24 14:04 -a--
2.webp 3 960 Kb 14.12.24 14:04 -a--
3.webp 3 559 Kb 14.12.24 14:05 -a--
4.webp 3 559 Kb 14.12.24 14:05 -a--
5.webp 3 559 Kb 14.12.24 14:05 -a--
6.webp 3 558 Kb 14.12.24 14:05 -a--
7.webp 3 552 Kb 14.12.24 14:05 -a--
8.webp 3 555 Kb 14.12.24 14:06 -a--
9.webp 3 555 Kb 14.12.24 14:06 -a--