# Odd CPU Usage Fixed by Logging onto Server **URL:** \ **Category:** General Discussion\ **Created:** [December 19, 2021, 2:57pm UTC](https://forum.inductiveautomation.com/t/odd-cpu-usage-fixed-by-logging-onto-server/54280 "2021-12-19T14:57:26Z")\ **Posts on this page:** 1\ **Showing post:** 16
**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:** [December 21, 2021, 1:07pm UTC](https://forum.inductiveautomation.com/t/odd-cpu-usage-fixed-by-logging-onto-server/54280/16 "2021-12-21T13:07:27Z")
Hi again Mack, good to hear you're getting closer to the root cause. Please view this thread on advice on going from 7.8.x to 7.9.x and beyond; > [@Upgrading from 7.8.5](https://forum.inductiveautomation.com/t/upgrading-from-7-8-5/54276): > > I am looking to plan how long it would take me to upgrade from 7.8.5 to 8.1 I see a guide for 7.9 to 8. Would that be the same as 7.8 to 8 and suffice as a guide? Or might there be additional things I should be concerned about? Also I really didn’t see in the guide, do you just import the 7.8 project into 8.1 and correct the differences in the guide, Or do you need to manually recreate windows? Thank you in advance > [@mcgheeiv](#): > > Any suggestion as to which minor level we should go to first is greatly appreciated. I did 7.8.4 to 7.9.12 in one step with no issues, however, all systems vary. > [@mcgheeiv](#): > > OS issues on the computers running Vision clients prevented this upgrade around 5 years ago. Ignition 7.9.10(+) uses an embedded Java 9 JRE for Vision client. 7.9.10 wasn't available in 2016, from memory it was circa 2018. --- _[View the full topic](https://forum.inductiveautomation.com/t/odd-cpu-usage-fixed-by-logging-onto-server/54280)._