# Device Load Factor

**URL:** <https://forum.inductiveautomation.com/t/device-load-factor/15781>\
**Category:** Ignition\
**Created:** [October 26, 2017, 1:49pm UTC](https://forum.inductiveautomation.com/t/device-load-factor/15781 "2017-10-26T13:49:27Z")\
**Posts on this page:** 1\
**Showing post:** 33

<div class="post-metadata">

**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\
**Post date:** [March 14, 2021, 12:45pm UTC](https://forum.inductiveautomation.com/t/device-load-factor/15781/33 "2021-03-14T12:45:47Z")

</div>

We fought everything trying to be stubborn and use AOIs. It wasn’t until I did some serious testing and reading across multiple scada systems and in depth study and testing with Ignition that we changed to a udt and aoi system. 95% of our base tags are now in udts. One one specific system that has 150k tags plus we went from 90-103% load factor down to 10%. That was enough for me to know that AOIs are going to give you a bad time. Do AOIs work? Yep. But it is a shakey foundation to build a large system on, in my opinion.

---

_[View the full topic](https://forum.inductiveautomation.com/t/device-load-factor/15781)._