Does RStudio recalculate all code blocks when...

Greetings all,
Does RStudio recalculate all code blocks by default when I knit a document together for HTML.
I have found that I run through my code, get and my results then I run Knitr to HTML and my code is run a 2nd time. Because my code may have long run times I am questioning the utility of running it a second time.

Is there a way to change this behaviour?
Thank You,

You can set cache = TRUE in your code chunk header to avoid this problem.

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