# Performance Limits for 27,000+ Modbus TCP/IP Tags

**URL:** <https://forum.inductiveautomation.com/t/performance-limits-for-27-000-modbus-tcp-ip-tags/112224>\
**Category:** Ignition\
**Created:** [November 17, 2025, 7:21am UTC](https://forum.inductiveautomation.com/t/performance-limits-for-27-000-modbus-tcp-ip-tags/112224 "2025-11-17T07:21:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![andy.liu](https://avatars.discourse-cdn.com/v4/letter/a/c67d28/32.png) [@andy.liu](https://forum.inductiveautomation.com/u/andy.liu)\
**Post date:** [November 17, 2025, 7:21am UTC](https://forum.inductiveautomation.com/t/performance-limits-for-27-000-modbus-tcp-ip-tags/112224/1 "2025-11-17T07:21:33Z")

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Hello Ignition Community,

We are currently planning a new SCADA project utilizing Ignition, and we have some questions regarding the performance of large-scale Modbus communication. We would greatly appreciate any shared experiences or official recommendations from Inductive Automation experts in the community.

### Project Overview

- **Protocol:** Modbus TCP/IP

- **Driver:** Using the native Ignition Modbus TCP/IP driver only.

- **Estimated Total Tags:** Approximately **27,000 tags**.

### Core Performance and Connectivity Questions

We primarily need to determine the limits of a single Gateway and how to optimize for performance. We have the following specific inquiries:

1. **Single Gateway Load Capacity:**

2. **Device Connection Limit:**

We look forward to your helpful responses and discussion!

Thank you all!

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**Author:** ![Matrix\_Engineering](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/matrix_engineering/32/19781_2.png) [@Matrix\_Engineering](https://forum.inductiveautomation.com/u/Matrix_Engineering)\
**Post date:** [November 17, 2025, 10:26am UTC](https://forum.inductiveautomation.com/t/performance-limits-for-27-000-modbus-tcp-ip-tags/112224/2 "2025-11-17T10:26:56Z")

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Is this architecture all on a LAN or polled over e.g. 4G infrastructure?

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<div class="post-metadata">

**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:** [November 17, 2025, 12:39pm UTC](https://forum.inductiveautomation.com/t/performance-limits-for-27-000-modbus-tcp-ip-tags/112224/3 "2025-11-17T12:39:18Z")

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1. There's no specific tag limit. Big server hardware should be able to handle hundreds of thousands of tags. Your Modbus devices are more likely to be the bottleneck than Ignition. You can easily poll at 500ms. Going much faster may require some network analysis (latency matters).

2. There's no specific device limit. It would be easiest to manage if you used many tags per device and used Modbus TCP concurrency to tweak performance.

You should use Ignition's 2-hour trial mode to mock up what you need.