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Problem:
The client is trying to register WPML on their site, which has become extremely slow (both backend and frontend). They encountered errors such as 'The Login is Invalid' and 'Connection attempt failed with "EAI_NONAME - Neither nodename nor servname provided, or not known"', suggesting issues with server firewall or invalid FTP host address.

Solution:
1. We recommended enabling debugging as per the instructions at https://wpml.org/documentation/support/debugging-wpml/ and sending over the Debug Log files.
2. We suggested removing WPML and OTGS Installer and reuploading them from fresh, then trying to activate them again.
3. We asked the client to check with their hosting provider if a firewall was preventing communication with the WPML server, as detailed here: https://wpml.org/faq/troubleshooting-registration/#wpml-plugin-cannot-connect-to-wpml-org
4. We provided a SQL command to potentially resolve the registration issue:

ALTER TABLE `wp_options`
CHANGE `option_id` `option_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT FIRST;

If these steps do not resolve your issue, or if the solution seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If needed, please open a new support ticket at WPML support forum for further assistance.