After importing from a CSV and then appying postage to this batch of mail.

The screen starts flickering multiple times a second and locks out user input for a minute or so until its done.

The URL keeps flashing and updating with urls such as this;

https://business.parcel.royalmail.com/payments/details/?key=true&cancelState=%7B%22name%22:%22orders%22%2C%22title%22:%22Orders%22%7D&returnState=%7B%22name%22:%22orders%22%2C%22title%22:%22Orders%22%7D

This makes import and processing take about 4 times longer than the week before.

vibecodingisbad