[WIP] Memory usage and timeout issues with latest version

[saranshj4]

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• Made sure you’re on the latest version
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Describe the bug
Many users are reporting issues due to memory usage and max_execution_time. The backup runs successfully after a refresh but is not as smooth as before. This mainly affects scheduled backups as they never completes.

To Reproduce
Steps to reproduce the behavior:
No clear steps to replicate. Backup are processed after a refresh.

Expected behavior
Backup should work normally without refreshing.

Related threads/tickets
https://wordpress.org/support/topic/sometimes-backup-gets-stuck/#post-17882635 (WP Optimize)
https://wordpress.org/support/topic/sometimes-backup-gets-stuck/#post-17878681 (Autoptimize)
https://wordpress.org/support/topic/max-execution-time-and-max-allocated-memory-errors/#post-17892047 (4.1.0 works)
https://wordpress.org/support/topic/max-execution-time-exceeded-while-listing-folders/ (WP Optimize is installed)
https://wordpress.org/support/topic/job-has-started-but-not-responded-for-10-seconds-23/
https://wordpress.org/support/topic/erreur-backup/

Additional context
Until now, we have learned that rolling back to the older version 4.1.0 fixes the issue. Also, it seems caching/optimization plugins could be the reason as few users reported conflict with WP Optimize, autooptimize.

Acceptance Criteria (for WP Media team use only)
Clear instructions for developers, to be added before the grooming

[saranshj4]

User confirmed fixed, maybe due to WPO or BWU update: https://wordpress.org/support/topic/sometimes-backup-gets-stuck/#post-17974243

[saranshj4]

One more user confirmed this because of WPO plugin: https://wordpress.org/support/topic/max-execution-time-exceeded-while-listing-folders/#post-18069198

[saranshj4]

One of the user did debugging and found that Wordfence and IONOS hostings could be culprit: https://wordpress.org/support/topic/error-with-database-backup-memory-limit-3/