Performance issues and errors when opening apps

[Suzanne_van_der_Tang]

During the last 2 weeks, our Qliksense production environment encounters a serious performance issue.

Symptoms:

- In mornings it takes quite a while to open an app. On screen the message "initializing" is displayed for a long time, and then, after a while, it shows "App is opened" for a while.

- The HUB screen shows an error message after a couple of minutes, stating something like "Error has occurred, connection timed out because of inactivity".

- Once the app finally opened, it works as expected (not very slow).

- Our test environment (other server) works fine (no errors, less users, but same amount of data).

- After the qlik services have been restarted, the system works fine again.

- Next morning, the system is slow again, and needs to be restarted all over again.

- Nprinting and Qlik tasks are running without issues.

Anyone has a clue as to where we should look to investigate/solve this issue?

[mpc]

Hi, 

First of all, is there any change on the server ? (Windows or NET framework update, Qlik Sense, or other) ?
Then, to troubleshoot the performance issue, you'll need to monitor CPU/RAM/Disk usage, and Qlik Sense activity. You need to check network related issue too, if the apps are store on a network location. 
You can also check in the Qlik Sense logs something happend when you open the app. Check the Windows Event viewer too. 

Regards