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What is the technical limitation? consider 301 redirects from index.php to seo-friendly urls

hello,
you can still have engagement benifits from it, you can try expanding the content, and add a nofollow tag to the links so it doesnt pass link juice to other pages.

The decision of whether to delete, merge, or enrich depends on your specific situation and priorities. If you have limited resources and the content offers little value, deleting is be the best course of action. Or if you can invest time to enhance the content or choose professional ways to access it, consider those options.

Just focus on providing valuable content to your users and search engines will benefit your SEO strategy in the long run.

Hello ,

A WordPress multisite benefits from a single domain authority, you can notice slower indexing for posts in languages other than English.

Google prioritizes indexing content in languages it understands and ranks well for. Your site's focus on English content gives google a deeper understanding, potentially leading to faster indexing for English posts. Content in less familiar languages might take longer, especially if google has less data about your site's authority in those languages. User engagement signals also influence's indexing speed. If your English content receives more user interaction), google might prioritize future English posts based on this positive response. Content in other languages might initially receive less engagement which leads google to observe user behavior before fully indexing it.

Also make sure your translations maintains the same level of optimization as your English content. This includes translation accuracy, relevant keyword usage in respective languages, and proper meta descriptions for each post. Search engines typically index high-quality content faster.

Search engines crawls websites frequently based on various factors like website size, update frequency, and overall health. If your english content subdirectory (e.g., /) receives more updates or has more pages, it might be crawled more frequently, leading to faster indexing. You will need to double check for any technical issues specific to your non-english subdirectories.

Issues like broken links, slow loading times, or missing sitemaps will delay indexing for those sections of your website.

Though the author domain stays constant, these factors can contribute to the observed indexing speed variations.

My suggestions -
-Focus on relevant keywords in the respective languages and create accurate meta descriptions for each post.
-Use tools like GSC and track indexing status and identify any technical issues specific to your non-english subdirectories.
-Update sitemaps for each language subdirectory to ensure google is aware of all content and can crawl it efficiently.