# \[Expression Functions\] performance of tag()

**URL:** <https://forum.inductiveautomation.com/t/expression-functions-performance-of-tag/10931>\
**Category:** Ignition\
**Created:** [December 17, 2015, 2:46pm UTC](https://forum.inductiveautomation.com/t/expression-functions-performance-of-tag/10931 "2015-12-17T14:46:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![marioquark](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@marioquark](https://forum.inductiveautomation.com/u/marioquark)\
**Post date:** [December 17, 2015, 2:46pm UTC](https://forum.inductiveautomation.com/t/expression-functions-performance-of-tag/10931/1 "2015-12-17T14:46:59Z")

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I have to show a tag value in a popup window.  
It seems that the expression function tag() is very slow (10-12 sec) to get the value compared to a direct binding one (2-3 sec).  
I’m using Ignition 7.6.7 and a Subscribed scan class (5 sec for a fast read).  
I’m sure the is computed immediately.  
Where can be the slowness?  
Thank you

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<div class="post-metadata">

**Author:** ![marioquark](https://avatars.discourse-cdn.com/v4/letter/m/22d042/32.png) [@marioquark](https://forum.inductiveautomation.com/u/marioquark)\
**Post date:** [January 11, 2016, 4:37pm UTC](https://forum.inductiveautomation.com/t/expression-functions-performance-of-tag/10931/2 "2016-01-11T16:37:51Z")

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Which delay time shoud I expect from the initialization of a template to the visualization of a tag value inside it?  
Consider a remote client and a MEM tag.  
Thank you