Change in rankings after page update - after index or after cache?

[AlmostHuman]

I've been doing some keyword optimization on some pages of my website and I've found myself wondering when I should expect changes to the rankings due to the fact.

I've noticed that, even though the cache of a page remains the same, snippets of text from the changed content are already displayed in the search results.

Does it mean that I should expect changes to the rankings even before the page gets cached since Google has already discovered updated content and displays it in search results or there is more to the equation?

[goodroi]

Google does not update everything at the same time. Some items are updated faster than others. Certain parts of the secret formula are only updated when Google manually runs the process. To make it even more confusing, Google likes to personalize the rankings so the ranking changes you see may be caused by your browsing history and not your SEO effort.

I would suggest a more casual approach to Google monitoring. If you did good research, the results will eventually show it.