Other than this bug, I don't see any delay in the C3 version of the scanner compared to the source-library scanner used for building this plugin.
I used the source code of this QR Scanner: webqr.com
Yes Sparsha I am not blaming on your plugin, it only takes 50-100ms to decode on this slow devices, and I have really to thank you for your work and effort...
THANK YOU VERY MUCH, REALLY!!!
its really stable plugin, even with the bug you mention, I just start the camera and make the person to press a buton to take an screenshot, then decode it: this way it never stop working.
about the library take a look at two ones, I tried... not enough skills, even that there is one that look so simple (just uses jQuery and I got stuck on this and C3):
1) one is instascan... such simple that just make a html with this simple one file - html code:
https://drive.google.com/file/d/118aCIbX9OPuPL6NmQi1yaisoOED3EFAR/view?usp=sharing
... so simple, but didn´t figure out how to implement in C3
(also there is a different demo https://schmich.github.io/instascan/ all from https://github.com/schmich/instascan)
2) nimiq from https://github.com/nimiq/qr-scanner#readme
this one is very very realtime in any device!
maybe you could take a look and see if something can be done!
thanks again!!