# SLC 5/04 via ControlLogix Bridge Communication Performance Tips? **URL:** \ **Category:** Ignition\ **Created:** [June 12, 2018, 5:43pm UTC](https://forum.inductiveautomation.com/t/slc-5-04-via-controllogix-bridge-communication-performance-tips/18428 "2018-06-12T17:43:39Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [February 7, 2025, 8:04pm UTC](https://forum.inductiveautomation.com/t/slc-5-04-via-controllogix-bridge-communication-performance-tips/18428/4 "2025-02-07T20:04:09Z")
Update: After replacing all the other DH+ devices with Ignition so only the SLC 5/04 with 64K was left, the ENBT/A died and we replaced the SLC 5/04 with a 5/05 to completely eliminate DH+ (and ControlLogix bridge). On the SLC 5/04, we got tag updates down to 1 s (from ~2.5 s) without overload by adding multiple SVC instructions in addition to setting the flags @pturmel notes. One SVC instruction helped, and adding more between large sections of code helped more. > [@Typical Performance between Ignition and AB SLC 5/05](https://forum.inductiveautomation.com/t/typical-performance-between-ignition-and-ab-slc-5-05/17262/8): > > I can confirm this solution worked for me as well. Clearing S:2/15 and S:33/7 yielded minor increases in performance but adding a SVC decreased my overload from 170% to 60% for a 600ms tag group It's still an obsolete PLC, but _less_ obsolete now. It looks sad next to Beckhoff PLCs and Ignition HMIs breezing along at 10 updates per second, but is comparable to Ignition HMIs using remote tag providers that are artificially limited to updating once per second. Hopefully that remote tag provider update limit becomes configurable at some future point: > [@Remote Tag Provider updates tags slower than Realtime Tag Provider](https://forum.inductiveautomation.com/t/remote-tag-provider-updates-tags-slower-than-realtime-tag-provider/84029/3): > > @Kevin.Herron, batching makes sense. However 1000 ms feels really slow. What are the chances we could get a setting for this, or get the default lowered to something like 100 ms? --- _[View the full topic](https://forum.inductiveautomation.com/t/slc-5-04-via-controllogix-bridge-communication-performance-tips/18428)._