How to escape a Duplicated Content Penalty.
A site`s main SEO issue was a domain parked on top, presumably resulting in a dup content penalty.
Have changed the parked domain to a 301 redirect (should it just be removed it altogether?) and replaced most of the site`s text a few weeks ago but still no significant organic performance change
Have we done enough to clear the dup content penalty ?
What lead time is it likely to be before we see organic performance change ? ?