# Tag is Bad Quality in UDT **URL:** \ **Category:** Ignition\ **Tags:** ignition81\ **Created:** [June 15, 2021, 8:46pm UTC](https://forum.inductiveautomation.com/t/tag-is-bad-quality-in-udt/47808 "2021-06-15T20:46:33Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [June 16, 2021, 2:30am UTC](https://forum.inductiveautomation.com/t/tag-is-bad-quality-in-udt/47808/5 "2021-06-16T02:30:00Z")
We're using all AOIs at the moment because we didn't know any better when we did our projects. I really want to do a performance test on this, as we've certainly had issues with PLCs being overloaded, even the latest models like the L8x series (maybe L9x is out now?) get choked up (at 1s poll rate we see these at like 160-200% load factor 😕 ). @bschroeder said his LF reduced from 100% down to 10%, but it'd be good to get some solid figures to go off. > [@Device Load Factor](http://forum.inductiveautomation.com/t/device-load-factor/15781/33): > > 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… --- _[View the full topic](https://forum.inductiveautomation.com/t/tag-is-bad-quality-in-udt/47808)._