# Ignition Edge limitation

**URL:** <https://forum.inductiveautomation.com/t/ignition-edge-limitation/88755>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [April 12, 2024, 6:23pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-limitation/88755 "2024-04-12T18:23:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Project2501](https://avatars.discourse-cdn.com/v4/letter/p/41988e/32.png) [@Project2501](https://forum.inductiveautomation.com/u/Project2501)\
**Post date:** [April 12, 2024, 6:23pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-limitation/88755/1 "2024-04-12T18:23:51Z")

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I recall originally edge have a 500 tag count limitation that was later removed. Is there a maximum recommended tag count that ignition recommends user adhere to? I recognize that the variability of edge devices makes this use case dependent.

The reason I ask, running edge in an Opto 22 device, No issues when the tag count was \< 1000. As we creeped up 2-3K and added perspective sessions, we started to see CPU utilization increase and occasional GAN errors. Simply disabling half the tags would remove the issue. Ended up disabling edge and going OPC directly from server to device, no more issues.

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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:** [April 12, 2024, 6:28pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-limitation/88755/2 "2024-04-12T18:28:53Z")

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> [@Project2501](#):
>
> added perspective sessions

This is more llkely the culprit than a few extra tags. Perspective is a CPU hog. See this discussion:

> [@Microsoft Virtual Machine Suggestion](https://forum.inductiveautomation.com/t/microsoft-virtual-machine-suggestion/86787/5):
>
> After going through that sizing guide, I'd add another vCPU for every 4-8 Perspective clients (of pretty much any kind), a GB of gateway RAM for every 4-8 light-duty Perspective clients, and 2-4GB of gateway RAM for every heavy-duty Perspective client. "Light duty" would be single page Perspective apps running in Workstation, or Mobile, or single-tab browser sessions, displaying dashboards with real-time tags, up to an hour (-ish) of real-time trends, and pre-computed statistics for longer time…

(Read the whole topic.)