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The console is slow in general, opening tabs, adding filters, previewing logs…
We also occasionally get a console error message of disconnections.
Best practices for tuning your QRadar system
https://www.ibm.com/support/knowledgecenter/SS42VS_SHR/com.ibm.Watsonapp.doc/r_Qapps_advisor_tuning_qradar.html
QRadar Tuning Guide
https://www.ibm.com/support/knowledgecenter/SS42VS_7.3.2/com.ibm.qradar.doc/b_qradar_tuning_guide.pdf