# High use of CPU

**URL:** <https://forum.inductiveautomation.com/t/high-use-of-cpu/110917>\
**Category:** Ignition\
**Tags:** ignition79, vision\
**Created:** [September 24, 2025, 1:43pm UTC](https://forum.inductiveautomation.com/t/high-use-of-cpu/110917 "2025-09-24T13:43:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Wladimir\_Celedon](https://avatars.discourse-cdn.com/v4/letter/w/9e8a1a/32.png) [@Wladimir\_Celedon](https://forum.inductiveautomation.com/u/Wladimir_Celedon)\
**Post date:** [September 24, 2025, 1:43pm UTC](https://forum.inductiveautomation.com/t/high-use-of-cpu/110917/1 "2025-09-24T13:43:37Z")

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Hi.

I’ve been watching the use of CPU in Ignition 7.9.5, for some reason it goes up to 96% and it doesn’t go down after a restart. I checked the threads and say many of them that describes:

Thread [webserver-230] id=230, (RUNNABLE)  
java.util.ComparableTimSort.minRunLength(Unknown Source)  
java.util.ComparableTimSort.sort(Unknown Source)  
java.util.Arrays.sort(Unknown Source)  
java.util.Arrays.sort(Unknown Source)  
java.util.ArrayList.sort(Unknown Source)  
java.util.Collections.sort(Unknown Source)  
com.inductiveautomation.ignition.common.util.TimelineList.sort(TimelineList.java:24)  
com.inductiveautomation.ignition.common.util.TimelineList.add(TimelineList.java:117)  
com.inductiveautomation.ignition.common.util.TimelineList.add(TimelineList.java:68)  
com.inductiveautomation.ignition.common.util.Timeline.addSegment(Timeline.java:46)  
com.inductiveautomation.gateway.tags.history.query.SCExecRecord.addToTimeline(SCExecRecord.java:185)  
com.inductiveautomation.gateway.tags.history.query.DatasourceQueryExecutor.initialize(DatasourceQueryExecutor.java:651)  
com.inductiveautomation.ignition.gateway.sqltags.history.query.AggregateHistoryQueryExecutor.initialize(AggregateHistoryQueryExecutor.java:78)  
com.inductiveautomation.ignition.gateway.sqltags.history.query.HistoryWriter.initLoader(HistoryWriter.java:140)  
com.inductiveautomation.ignition.gateway.sqltags.history.query.HistoryWriter.execute(HistoryWriter.java:210)  
com.inductiveautomation.ignition.gateway.sqltags.SQLTagsManagerImpl.queryHistory(SQLTagsManagerImpl.java:1297)  
com.inductiveautomation.ignition.gateway.project.ProjectSettingsCache$ProjectDefaultTagManagerFacade.queryHistory(ProjectSettingsCache.java:666)  
com.inductiveautomation.ignition.gateway.servlets.gateway.functions.QueryTagHistory.invoke(QueryTagHistory.java:96)  
com.inductiveautomation.ignition.gateway.servlets.Gateway.doPost(Gateway.java:405)  
javax.servlet.http.HttpServlet.service(HttpServlet.java:707)  
javax.servlet.http.HttpServlet.service(HttpServlet.java:790)  
com.inductiveautomation.ignition.gateway.bootstrap.MapServlet.service(MapServlet.java:85)  
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:837)  
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)  
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)  
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)  
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)  
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1160)  
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)  
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)  
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1092)  
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)  
org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)  
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)  
org.eclipse.jetty.server.Server.handle(Server.java:518)  
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:308)  
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:244)  
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)  
org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)  
org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)  
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceAndRun(ExecuteProduceConsume.java:246)  
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:156)  
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:654)  
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:572)  
java.lang.Thread.run(Unknown Source)

What is the meaning of that?.

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<div class="post-metadata">

**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\
**Post date:** [September 24, 2025, 1:58pm UTC](https://forum.inductiveautomation.com/t/high-use-of-cpu/110917/2 "2025-09-24T13:58:06Z")

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Is your historian SQL database server getting bogged down? How is the performance looking on that? Do you have proper indexes on the historian tables?

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**Author:** ![Alex\_Guyer1](https://avatars.discourse-cdn.com/v4/letter/a/5f8ce5/32.png) [@Alex\_Guyer1](https://forum.inductiveautomation.com/u/Alex_Guyer1)\
**Post date:** [September 24, 2025, 9:02pm UTC](https://forum.inductiveautomation.com/t/high-use-of-cpu/110917/3 "2025-09-24T21:02:06Z")

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This might provide some helpful steps to narrow it down.  
[[TUTORIAL] How to Debug High RAM Usage - Ignition - Inductive Automation Forum](https://forum.inductiveautomation.com/t/tutorial-how-to-debug-high-ram-usage/108181)