# 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:** 23

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [March 12, 2021, 6:35pm UTC](https://forum.inductiveautomation.com/t/device-load-factor/15781/23 "2021-03-12T18:35:17Z")

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More discussion of this phenomenon over here:

> [@Cannot read some tags inside Rockwell AOI](http://forum.inductiveautomation.com/t/cannot-read-some-tags-inside-rockwell-aoi/38393/3):
>
> What Mike said, but also: Don’t. All AOI’s have EnableIn and EnableOut booleans that are locked to “Hidden” and therefore prevent most optimization of the data traffic to read instances of these data types. Ignition’s Logix driver cannot do bulk reads on AOIs. Do very much of this and your Logix driver will choke. I strongly recommend that any AOI you design yourself use one or more InOut parameters of another data type, with instances of those datatypes elsewhere. Place all of your extern…

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