generator.image Printing image too slow

[LeiYao123]

At first, I was using ESC_ Pos_ Utils, esc_ Pos_ Utils_ Plus can only use imageRaster to print images, but not image. Actually, I don't know the difference between these two because I don't understand the printing instructions. As a web developer, I don't understand native development,
After using your plugin, I found that both image and imageRaster methods can print images normally, but the speed is still slow. After printing the following image, the image method takes about 10 seconds, while imageRaster takes about 20 seconds. I don't know why?
(Note that the entire ticket below is an image through widgetToImage)

The printing time is shown in the following figure

On the left is the printed effect, and on the right is the time consumption statistics
Time is mainly spent on bytes += generator.image(decodedImage); bytes += generator.imageRaster(decodedImage);

[deverlex]

Use raster graphics will print faster, but it's have a bug now

[BrianTV98]

@deverlex de
I'm also interested in Use raster graphics for printing. If you have any solutions or ideas to do this, let me know.