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sometimes sites fluctuate wildly in the SERPs for a couple of weeks before the positions stabilise.
crobb305 - yes I have seen that pattern before, though your spikes are somewhat higher than the ones I have seen.
I think there is some kind of damping in the algorithm - to prevent rises and falls being too drastic (refer to the early Google monthly updates for the chaos drastic rises/falls caused) and that those spikes are when the undamped results are unleashed on the users for a short period.
I think the trend line is the most important thing - when it is going up you are good, when it is going down - you need to be looking for a cause. If it is flat work on developing the scope of the site.
Say there is a significant change in your position in the SERPs for whatever factor which would cause a 50% increase in your traffic overnight - instead of getting all of that in one hit it will slowly release you that traffic at say 10% per month thus bringing you steadily closer to the correct figure.
last announced Penguin update was Oct. 4, 2013, more than 7 months ago, which is a longer wait than normal. I hope this extra wait time means that they're working on it, trying to fix it.
I think many of us here have a similar hope, I know I do. I got my hopes up for early April, but no such luck. Seems like they have been doing some very brief, intermittent test roll out but nothing solid. I've seen a few sites that lost their sitelinks amid the first penguin have the sitelinks show up briefly and then disappear again over the last few weeks. Not to mention wildly fluctuating rankings.
small spike 3/13 7,200 pages
large spike 3/24 - 3/29 15,000 pages/day
small spike 4/9 6,900 pages
small spike 4/15 - 4/16 6,800 pages/day
small spike 4/26 5,500 pages
average crawl: 2,000 pages/day
I've seen a few sites that lost their sitelinks amid the first penguin
[edited by: aakk9999 at 4:01 pm (utc) on May 7, 2014]
[edit reason] Changed link to go directly to the image [/edit]
I think we actually saw an update, but it f*cked up rankings.