How to Boost Crawl Efficiency with Dynamic Sitemaps?

Hey everyone,

Following up on the great discussion about 'Addressing Persistent Crawl Budget Exhaustion with Dynamic XML Sitemaps on Large-Scale Laravel Deployments' – I've been trying to implement some of the strategies, but I'm hitting a wall.

• Context: We've got a large SaaS platform (millions of pages) built on Laravel. Our crawl budget is still getting hammered, and we're struggling to get new content indexed quickly.
• Goal: Improve crawl efficiency and achieve faster indexing speed for our constantly updated content.
• What I've tried:
  • Implemented a dynamic sitemap generator in Laravel that pulls URLs directly from the database.
  • Split sitemaps into smaller files (e.g., 50k URLs each) using sitemap index files.
  • Prioritized 'lastmod' dates based on content updates.
  • Used a queue for sitemap generation to avoid performance hits.
• The Problem:
  • Google Search Console still reports high 'Crawled - currently not indexed' pages, especially for newer content.
  • Sitemap processing time seems inconsistent, and sometimes GSC shows "Couldn't fetch sitemap" errors, even though the sitemap is accessible.
  • Despite dynamic generation, I'm not seeing a significant improvement in crawl efficiency or indexing speed for fresh content. It feels like Google isn't picking up the 'lastmod' changes as quickly as I'd hoped.
• My Question: What are some advanced techniques or common pitfalls when trying to truly boost crawl efficiency and indexing speed with dynamic sitemaps, especially on a large Laravel application? Are there specific server configurations, caching strategies, or even different ways to structure the sitemap generation that I might be missing?
• Specific Areas of Interest:
  • Best practices for 'lastmod' implementation on constantly changing content.
  • Strategies to ensure Google consistently fetches and processes dynamic sitemaps without errors.
  • Any specific Laravel packages or architectural patterns that have proven effective for ultra-large-scale dynamic sitemaps.

Any insights from those who've tackled similar challenges would be incredibly helpful! Thanks in advance!