@mysweetcate thank you mate. i already read the article before writing here. Kinda old one but still useful. However, my problem isn’t gone.
I have found out all the trouble triggered by my theme’s included core plugin, which theme creators says that it is a must for the theme working correctly. When i deactivate that plugin, website speed dramatically increases. I don’t see why this core plugin has got something to do with permalinks, but this core plugin doesn’t seems to like custom permalinks anyway. I also suspect that core plugin doesn’t like the plugin called Classic Editor created by WordPress staff. I deactivated the classic editor and website performs even better! And plus, now my custom permalinks working well with core plugin ??
I solved my problem with trial and error doctrine ??
Thank you for all your valuable answers.
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This reply was modified 3 years, 2 months ago by Canerik.