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I also have an established site, which has just changed nameservers. Google traffic has suddenly and coincidentally dipped drastically.
I am hoping that this is a temporary lull because of the nameservers change.
Anyone else had this reaction to nameservers change?
The site works fine, just as before, no errors. No changes have been made otherwise to the site.
If you purchase a site, change the Whois data then do no major changes for one and best two major updates. If the old owners added lots of fresh content then your gonna have to keep this up to a degree. If it was a site that was never updated and new content rarely added leave well alone. Continue to add the odd link once in a while for good measure but this would not be the best time to being adding 100ís off links at a time (not that there is a good time to hoard!)
If all is good after updates settle then change the server. If you change the sites content all at once then no matter what you are up to the site will be sandboxed. If you plan to build a new site make the old site accessible to spiders and possible not users. If you swap one site for another on the same domain....sandbox.
IMO doing this to beat the sandbox does work but itís a fine line and in some cases it can take just as long.
Best thing is to either start new domain or purchase a site which is very similar in content to the one you wish to develop.