Thank you for your plugin.
My problem is that I'm unable to cache the sitemap generated by this plugin with W3TC. As a result, I - and Google do so - need many seconds - up to 10 ! - to load any sitemap files...
See here for loading time details : http://www.webpagetest.org/result/130214_3M_2KD/
I've tried to force cache in W3TC, inserting
in "Non-trailing slash pages" to force caching, but all I get is an empty file.
The only way to get a correct sitemap file is to put
in "Never cache the following pages"
Any way I can fix that ?
Thanks for your help.