For a bit of background, here's the original (short) Traffic Shaping thread from 2010.
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webmasterworld.com...]
And this is the popular thread from 2012
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webmasterworld.com...]
I still get Zombies, they don't convert. They don't interact. They do nothing. I get the a lot less than I used to, and I'm happy.
Many people I respect don't believe in them. Tedster went off the idea after failing to nail down a mechanism. Netmeg has never subscribed. Leosghost thinks it comes down to serving mobile poorly. The problem is, I would never spot it on someone else's site - you only know when traffic patterns change on your own site.
Zombies, on their own, are not a problem- apart from incremental bandwidth consumption, I suppose. It's only a problem when combined with Traffic Shaping / Throttling. This is another controversial topic that many respected webmasters absolutely do not believe in. And again, you have to ask the question of HOW does Google actually implement any perceived shaping.
Well, some answers to that question include Dayparting, personalisation, user intent reinterpretation, and auto-suggestions. Personally, I think Autosuggest is a major factor these days. To take a trivial example, type the letter "i" into Google, and I am suggested either
OR
My previous term being "middle east" and "Eskimo" respectively.
Also, when you think about it, it's probably more fair to rotate Page 1. I mean, for 10,000 relevant pages of reasonable quality content, is it fair that only 0.1% of them get any traffic? Or would it me more fair to rotate the top 100 sites (with the "natural" top 10 getting more time proportionately), so that 1% of pages get at least a trickle? In this scenario, changing your "time-at-the-top" recipe would appear as traffic shaping.
Anyway, irrespective of the actual mechanism, many of us are certain we have a pre-set level of traffic. A good morning tapers off to a dull afternoon, a disappointing day suddenly ends with a bang. Any time you're off the glide-path, you get Shaped until you are back in your limits. And then the Zombies come. Same traffic, less conversions. Impending apocalypse.
On the bright side, my Zombies now arrive as part of a complete referral shift. That is, I suddenly lose traffic to some pages while getting new traffic to previously quiet pages. I strongly associate this with an impending mid-level core algo change. When the algo change occurs, I have a correlation where the high-converting pages (of both before and after the Shift) get sustained traffic, while low-converting lose.
I assume my experience is actually what Google is trying to achieve on other sites too. However, listening to the chatter here, they seem to get this wrong far more often than they get it right.
For context, I'm a reasonable sized ecom, in UK, selling stuff you can typically buy on Amazon for less money than we charge. We routinely outrank Amazon for generic keywords (vanity phrases), and consistently on product searches and long tail.