Dragon slow resolving host

I’ve been using Dragon happily for about a month, and have just updated to the new version. Now things are very slow, with “Resolving host” appearing for long periods of time before any site loads - even Google. Having found a few posts elsewhere relating to this same problem with Chrome, I deleted the cache, history, etc, and switched off DNS pre-fetching, but these made no difference. Firefox loads same sites perfectly OK.

I’ve now switched back to the previous version of Dragon ( which is behaving itself.

Any ideas?