# Ignition High Overload on Tags Sampled at 1000ms **URL:** \ **Category:** Ignition\ **Tags:** opcua, ignition81, perspective\ **Created:** [October 16, 2025, 1:54am UTC](https://forum.inductiveautomation.com/t/ignition-high-overload-on-tags-sampled-at-1000ms/111497 "2025-10-16T01:54:36Z")\ **Posts on this page:** 1\ **Showing post:** 2
**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:** [October 16, 2025, 10:54am UTC](https://forum.inductiveautomation.com/t/ignition-high-overload-on-tags-sampled-at-1000ms/111497/2 "2025-10-16T10:54:16Z")
> [@pedro.pansini](#): > > for most of the AOIs This is the issue, reading aoi tags will always be slow and inefficient. Reading UDT tags however will be fast. Let me dig up another post.. This while topic is super useful, but my post linked shows a table of performance for reading different types of tags. > [@Ignition & Logix Best Practice Tips for better communications](https://forum.inductiveautomation.com/t/ignition-logix-best-practice-tips-for-better-communications/60386/42): > > I recently decided it was time to actually test the theories with scan rates for different structures in the PLC, and found the results below. What I found (obviously) backed Phil's recommendations to only read UDT tags and to ensure that all members of them are set to at least read access. However what I found was negligible difference in response rate at 100ms when reading the UDT tags from within different structures (e.g. individual UDT instances at the root/controller level, addressing UDT… What's your cip connection size set to in your device connections in ignition for those plcs? It should be set to 4000 not the default 500 --- _[View the full topic](https://forum.inductiveautomation.com/t/ignition-high-overload-on-tags-sampled-at-1000ms/111497)._