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Qlik Sense Desktop performance

Hi guys,

I have a question regarding the performance of Qlik Sense. I have a main table which has about 300 million rows with 21 columns.

Qlik Sense is sometimes having trouble processing the data. Sometimes, it will display an error (Calculation error, forgot the specific message). Also, as Qlik sense processes the data, CPU usage will peak at 100%. Any suggestion?

Current Setup:

Processor: Intel Xeon X5690 (4 physical cores, 4 logical cores)

Ram: 20gb

Hoping for a response, thanks!