Errors Since WordPress Site Migration, Elementor Conflicts

Hello, I have been experiencing problems since migrating my WordPress sites to OVH.
Visually the sites work, but once in the dashboard, if I try to make changes to my site via Elementor, the pages do not display. Elementor throws an error.
I have run several tests with the plugins, etc. When WooCommerce is enabled and Elementor Pro is disabled, the page displays, but very slowly. However, when both are enabled, a 500 error appears in the console.
My sites were perfectly functional before the migration, very fast and smooth, even when I made changes. But since the migration it's been a disaster. I've been working on it for several days without success.
The Apache logs show, among other things:
AH10143: FastCGI comm with server aborted: read failed
AH10149: FastCGI incomplete headers (0 bytes)
End of script output before headers: admin-ajax.php
The requests to /wp-admin/admin-ajax.php and /wp-json/elementor/... fail after about 10 to 24 seconds..
Someone could help me..
Thank you!

Switch to a development environment

https://wordetweb.com/word-et-web/WORDPRESS-guide-installation-de-WordPress-premier-domaine-chez-OVH-FR.htm#_P2__-

Hello,

Such a timeout, which ends with an error message, is often caused by a request your site makes to an external service, and that outgoing connection fails with a timeout.

Check the "out" log of outgoing connections in Hosting > Logs and statistics

I don't know if failed connections are logged. I assume they are.

Thank you very much for your reply, I have looked at the "out" log and here is the information I have, but I don’t see how this can help me solve the problem..

Re-hello,

These two IP addresses belong to Cloudflare. It's impossible to trace back to the real owner.

I advise you to disable all plugins, and reactivate them one by one, those that are essential for your site.

You will get a lot more detail by switching to development environment.

See the paragraph in my guide: P2 - Error 500 - Development Environment