UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Steps to reproduce the problem:
Unzip and run the attached tester, or navigate to https://algotec.github.io/test-png-decompress/
Click 'Run Test' and wait for the results. 
Compare Chrome to IE11, Edge, Firefox and Safari.
The tester:
1. Loads 100 images as blobs using XHR and creates object URL's
2. Creates Image objects and loads each with the blob URL, using img.src = URL. 
3. Draws each image to a canvas using context.drawImage
4. calculate the average time it takes to performs steps (2) and (3)

What is the expected behavior?
We expect Chrome to provide similar or better performance of image creation, decompress and draw as other browsers. 

What went wrong?
calling img.src = <blob URL> is consistently slower in Chrome when comparing to all other browsers (2-3 times slower)

calling context.drawImage is consistently slower in Chrome when comparing to IE11 and Edge (about 2 times slower). Chrome is faster than Firefox and Safari by 20-50%. Developer tools show that most of the time is spent in "Decoding Image" which we assume is PNG decompression.

These results are consistent through different CPU & GPU hardware and different operating systems. See attached excel file.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 67.0.3396.99  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version:
 

Deleted: test-png-decompress.zip 224 KB

test-png-decompress.zip 224 KB Download

Deleted: png-decompress-test.xlsx 10.7 KB

png-decompress-test.xlsx 10.7 KB Download