# Blocked Threads **URL:** \ **Category:** Ignition\ **Created:** [May 8, 2021, 2:36pm UTC](https://forum.inductiveautomation.com/t/blocked-threads/46503 "2021-05-08T14:36:28Z")\ **Posts on this page:** 1\ **Showing post:** 2
**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:** [May 8, 2021, 3:31pm UTC](https://forum.inductiveautomation.com/t/blocked-threads/46503/2 "2021-05-08T15:31:02Z")
The definitive answer is to use Flight Recorder or the JDK's debugging tools to examine the problem threads. Not particularly simple to execute. Support can probably help with those. In the meantime, these topics might help you trim the list of possible culprits: > [@8.0.16 Upgrade thousands of timed Waiting Threads Lower Performance OPC UA and Perspective](http://forum.inductiveautomation.com/t/8-0-16-upgrade-thousands-of-timed-waiting-threads-lower-performance-opc-ua-and-perspective/41100/12): > > Thanks Kevin, I’m doing a bit of a sweep on all new additions added since the problem started. Hopefully this is a quick find. > [@Is anyone else having crippling issues after adding Perspective to projects?](http://forum.inductiveautomation.com/t/is-anyone-else-having-crippling-issues-after-adding-perspective-to-projects/44306): > > Since we rolled out v8.1.0 and Perspective to one of our largest clients (280k tags, 70 Vision clients, + now 8 Perspective clients running inside of Vision’s Web Browser component), we’ve had non-stop issues with extremely high server CPU usage (90-100%) and incredibly slow clients (due to server CPU). We’ve been in contact with support, however have yet to find a reliable cause and solution. We removed all Alarm Status Table components from the Perspective Views as these seemed to be causing e… > [@Perspective Workers High CPU Usage](http://forum.inductiveautomation.com/t/perspective-workers-high-cpu-usage/28115): > > Greetings, My organization has an Ignition Gateway instance running version 8.0.3-rc2 (b2019072512). The Java version is 11.0.3+7-LTS running on an Ubuntu Linux instance on amd64. On average the entire Gateway runtime is eating up ~80% CPU usage. The significant offenders appear to be perspective-worker threads, as shown: Our team will attempt to disable a potential resource intensive page and investigate further. I don’t think this should be normal b… > [@Performance slow after upgrade from 8.1.1 to 8.1.2/3](http://forum.inductiveautomation.com/t/performance-slow-after-upgrade-from-8-1-1-to-8-1-2-3/44187/5): > > I had planned to Monday, thanks. --- _[View the full topic](https://forum.inductiveautomation.com/t/blocked-threads/46503)._