# Indirect Tagging in Expression

**URL:** <https://forum.inductiveautomation.com/t/indirect-tagging-in-expression/86771>\
**Category:** Ignition\
**Tags:** ignition81, perspective, scripting\
**Created:** [March 4, 2024, 4:04pm UTC](https://forum.inductiveautomation.com/t/indirect-tagging-in-expression/86771 "2024-03-04T16:04:30Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [March 4, 2024, 4:38pm UTC](https://forum.inductiveautomation.com/t/indirect-tagging-in-expression/86771/4 "2024-03-04T16:38:13Z")

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This will work, but note that for performance you should really use two custom properties with indirect tag bindings, and do the sum in a single expression referencing those two custom properties. The `tag()` function can't be optimized the same way indirect tag bindings can, so it's a performance pitfall.

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