This question already has an answer here:
I'm about to do a website relaunch in a couple of months. It's a WordPress site. The relaunch will include these changes:
- changes in content, both text and images
- a new WP theme, thus changes in the DOM as well as design changes
- some minor structural changes
The domain luckily stays the same.
In terms of SEO I remember reading somewhere, that it is wiser to not change everything at once, but rather do changes gradually. Especially to not make changes with the content and the design/DOM at the same time. But I cannot find that same advise anymore anywhere.
So my question is: Is it better for your Google rankings to do all the above changes at once, or do them gradually, hence changing the theme first, than waiting 4 weeks or so and then doing changes to the content?