Thank you for this great plugin.
I believe I found a small bug.
I had a really slow post creation time.
After alot of debugging I found out that even if this box is unchecked:
"Check this box to enable XML sitemap functionality."
if this box is also unchecked (this box is not displayed unless the previous one gets checked) "
Don't update the XML sitemap automatically when a post is published."
the sitemap will get generated at every post. When you have a site with 5000+ post this becomes slightly problematic for content creators.
It would appear that the default should be for that hidden box to be checked, or the behavior int he code needs to be modified to allow for this.