# Massive latency issues on HMI **URL:** \ **Category:** Ignition\ **Created:** [August 1, 2024, 5:45pm UTC](https://forum.inductiveautomation.com/t/massive-latency-issues-on-hmi/94073 "2024-08-01T17:45:28Z")\ **Posts on this page:** 1\ **Showing post:** 10
**Author:** ![lrose](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lrose/32/62724_2.png) [@lrose](https://forum.inductiveautomation.com/u/lrose)\ **Post date:** [August 1, 2024, 6:00pm UTC](https://forum.inductiveautomation.com/t/massive-latency-issues-on-hmi/94073/10 "2024-08-01T18:00:16Z")
Are you using the comm port on the processor itself or a separate 1756-EN\* card? > [@Josh\_Allen](#): > > Especially probably with AOIs that are using aliased tags that are not enableIn/EnableOut to UDTs I'm not sure this is correct. ~~My understanding is that the main issue with AOI tag types being read is the EnableIn/EnableOut tags are locked to "Hidden" from external access and can not be changed from that.~~ Edit: This was not correct, but the link is still pertinent to the conversation. > [@Cannot read some tags inside Rockwell AOI](https://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… > [@Kevin.Herron](#): > > Try Phil's module. > [@Josh\_Allen](#): > > has 7 HMI each equipped with **Ignition Edge** on a Dynics HMI > (emphasis added) I believe these two things are contradictory unless you're going to pull some big plugs for @pturmel --- _[View the full topic](https://forum.inductiveautomation.com/t/massive-latency-issues-on-hmi/94073)._