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This thread is resolved. Here is a description of the problem and solution.
Problem: Hi, I noticed big differences in loading speed of the same page with the base language and secondary languages. The secondary language pages take around the double of loading time. Try in GTmetrix or other tool.
Solution: Please deactivate the browser redirect function and let me know if the issue persists.
Also, please visit this link: https://wpml.org/faq/prevent-performance-issues-with-wpml/