If this was a consistent behaviour we would probably have been notified about it by many users. But since you’re with Windows, there is a random factor of the good will of microsoft and all other installed software: antivirus, firewalls and similar security systems, as siril is connecting to a remote website for this operation.
Agreed, thank you for your input Vincent. It seems as though this issue is peculiar to my OS/PC. I’ll try to trace it via Windows logs.
Could you try again with disabled “Using cache” option?