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This thread is resolved. Here is a description of the problem and solution.
Problem: When the language is switched, there is a delay before the page is redirected
Solution: When you use a domain per language, an AJAX request is made, and then causes this short delay.
In WPML > Languages > Language URL format, there are three options when "A different domain per language" option is selected: Using this last option "Disable this feature", the request is not made with AJAX and without delay.