Same issue here. It's OK to consider any feature as legacy technology, but leave it working as it was before, never broke it and look away as if nothing is happening...

Same!! Many files with +1000 lines and it takes around 20 seconds to be able to edit the file each time! This is unnaceptable.

Hi @catandiscovery, Apple finally solved the problem. We have opened some tickets through https://developer.apple.com/contact/, but none of them was effective. Finally, the way to find a solution was to request a phone call with support. We explained to them the problem with all the details, and then they requested us to send by email all the information (Apple Store Connect screenshots, email screenshots, product IDs, etc). 48h later, the problem was solved. We also think it needs to be escalated to Apple's engineering team.