There is few things I check when changing WP theme - what happens with bounce rate/time spend on site after change? Is the new theme 100% compatible with mobile devices? How fast does it load? There are huge differences between individual themes and it all affects SEO.
Wow...good to know. From what my programmer tells me - coding is better on the new theme. But that all makes sense - page structures will change, pages won't be where they originally were - something huge to consider.
Any change in user experience and page/link structure will definitely have an SEO impact. Monitor all the important stuff, 404 errors, site speed and time on page..
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