I'd like to be co-maintainer of this project.

I've used "XML sitemap" for a lot of projects, also have created custom fixes for different projects to speed up processing XML sitemaps.

My plan:
1) Add fixes for speed-up of processing XML sitemaps;
2) Update code with new Drupal 8.3/8.4 code standards;
3) Remove deprecated calls;
4) Manage other issues and patches.

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AexChecker created an issue.