Highwinds owns back-end providers Newshosting, Usenetserver, and now apparently Easynews. If you do a traceroute to the NNTP server address, you can see their details.
For resellers, it seems SSL encryption is usually handled on the frontend server -- that's the server(s) that the reseller owns and maintains themselves. That's why SSL performance can vary greatly from one reseller to the next.
When Ngroups/Usenet-News first started offering SSL about a year and a half ago, on an experimental basis, it seemed a lot faster than it does now. I think that people should really only use SSL if they really need it -- such as if their ISP throttles usenet connections (on all ports) using packet shaping.
If you go to AnchorDudes Usenet Newsgroup Server FAQ - www.newsgroupservers.net - you can see the list of providers (actually resellers) that use Highwinds-owned backend servers.
Newshosting.com
Usenetserver.com
easynews.com
newsdemon.com
anonymousnewsfeed.com
blocknews.net
buzzardnews.com
flashnewsgroups.com
iunsenet.com
maximumusenet.com
meganetnews.com
news4u2.com
newsfeeds.com
newsgroupdirect.com
ngroups.net
teranews.com
thenewsgroups.com
thundernews.com
tigerusenet.com
titannews.com
uncensorednewsfeed.com
usenet.com
usenet.se
usenetguide.com
usenet-news.net
usenetrocket.com
cox.net (ISP)
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