Background of the issue:
I am trying to check why the website is very slow. I see a lot of wpml related issue in the log file. The issue can be seen on the entire page: الرابط المخفي.
[10-Sep-2025 17:56:00 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 17:56:30 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 19:15:38 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 19:15:56 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 19:16:22 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 19:16:41 UTC] PHP Warning: Cannot modify header information - headers already sent in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
[10-Sep-2025 19:53:01 UTC] Cron átütemezési eseményhiba a horoghoz: wp_fastest_cache_Preload, Hibakód: invalid_schedule, Hibaüzenet: Esemény ütemezés nem létezik., Adatok: {"schedule":"everyfiveminute","args":[],"interval":300}
[10-Sep-2025 21:21:00 UTC] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/klauzalh/public_html/wp-cron.php:30) in /home/klauzalh/public_html/wp-content/plugins/sitepress-multilingual-cms/classes/request-handling/class-wpml-language-per-domain-sso.php on line 123
Symptoms:
The website is experiencing very slow loading times.
Questions:
Why is the website loading very slowly?
How can I resolve the slow loading issue?
