# Performance core principles: 1. Unstored calculations

**URL:** <https://the.fmsoup.org/t/performance-core-principles-1-unstored-calculations/1857>\
**Category:** NickLightbody's\
**Created:** [March 10, 2021, 1:06am UTC](https://the.fmsoup.org/t/performance-core-principles-1-unstored-calculations/1857 "2021-03-10T01:06:25Z")\
**Posts on this page:** 1\
**Showing post:** 21

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**Author:** ![Cecile](https://yyz2.discourse-cdn.com/flex030/user_avatar/the.fmsoup.org/cecile/32/98_2.png) [@Cecile](https://the.fmsoup.org/u/Cecile)\
**Post date:** [March 9, 2021, 11:36pm UTC](https://the.fmsoup.org/t/performance-core-principles-1-unstored-calculations/1857/21 "2021-03-09T23:36:05Z")

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> [@Malcolm](#):
>
> I'm not sure when unstored calcs are performed. Is the unstored calcs performed when the record is loaded or is it only performed when the field is included and visible on the layout?

[Starting with 18 everything gets calculated](https://the.fmsoup.org/t/starting-with-18-everything-gets-calculated/765) Doesn't need to be visible. Every refresh of window or record loaded.

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