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[webmasterworld.com] by engine - 4:03 pm on Aug 1, 2013 (utc +1)
There is certainly a disconnect/time lag between Google spidering site changes and those changes taking effect, and with the "rolling Panda" and Penguin (in which remote changes may impact your site) it really is getting impossible to get a clear idea of what is going on.
The results are fluid but not as much as we would believe.
When updates are rolled out they change the value of pages/links. The change in values makes the current rollout instantly obsolete which will impact the next rollout, and the next. While the changes are current they impact page rank which sends ripples out that won't be accounted for until a future update.
The trick is to not add more flux to the ripples hitting your own site by making too many dramatic changes. Reduce spam pointing at your site, create great content and acquire solid backlinks where possible... but don't turn the puzzle upside down too often with dramatic changes or you keep starting over.