Hi All, Just want to check here to see if anyone has seen something similar: Client has 5 Netscalers, I have upgraded 3/5 from 13.0 to 13.1 52.19 without issue however the remaining 2 which are a HA Pair. After Upgrading, the GUI and CLI is very slow and unresponsive, Device is showing as 100% CPU usage in vsphere and some VIP's / Services down. Have a ticket logged with Citrix but thought I would check here. Any suggestions welcome. 🙂

Have you checked to make sure the License is still applied right after the upgrade? I have had multiple issues upgrading (especially VPX appliances) from 13.0 to 13.1 with an old license file (dated prior to the release of 13.1).

Licensing I applied just prior to the upgrade as we have seen that issue at other clients also so Licensing was all good after the upgrade but something definitely wasn't happy after the upgrade. Seen CPU spike on the other devices too but this HA Pair was almost unusable through GUI or CLI post upgrade

If the CPU is actually busy, you should be able to tell what process is using it. This is a good KB article that assists in troubleshooting high CPU. https://support.citrix.com/article/CTX570268/how-to-troubleshoot-high-packet-or-management-cpu-issue-on-citrix-adc

check your cpu yeild settings if its a VPX on vsphere. But as others have said top via command line will give you more info