Have you tried the suggestions given in my previous post? I just tested using Safari 10 on macOS Sierra and am unable to replicate what you are seeing:

posted by x.15a2 Community Leader1 year and 5 months ago Link

I wonder if it is not the same issue as https://duck.co/forum/thread/22754/slow-...
posted by <hidden> • 1 year and 4 months ago Link
Are you still experiencing this issue?

If so, can you go to https://duckduckgo.com/settings, click "Show Bookmarklet and Settings Data" in the right column and copy the cookie data here? Or feel free to reach out directly if you don't want to share publicly (brian@duckduckgo.com).
posted by brians Staff1 year and 4 months ago Link
Clearing website data fixed the issue. If I get it again, I'll share the cookie data.
posted by <hidden> • 1 year and 4 months ago Link