Decrease playback speed of metadata QR code as a solution for older/basic phones

[mochet]

Explained here: novasamatech/parity-signer#2048

Using an older or more basic smartphone, the metadata QR code has such a high playback speed that the camera cannot track the QR code between frame updates. It is very obvious this is the issue because the QR code is quite blurry despite being in focus.
Increasing the display size of the metadata QR code did not remedy this problem, as the camera simply cannot keep up with such a quickly changing image.

Using this tool: https://ezgif.com/split I was able to save the animated metadata QR code manually and reduce the playback speed of it, and this helped significantly to be able to scan the code fully.

It would be great if the Metadata Portal could have a reduced speed of playback for the animated metadata QR code for older or more basic smartphones.