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You need to start using Datawarehouse (DWH) solution and then feed data to tableau. For that you need to setup data pipelines and then transform data in the DWH, move all the custom queries into the DWH. This process is called ELT. You need AWS Redshift or Google Bigquery, a serverless scalable solution, this is the bottle-neck on your current SQL, not meant for processing millions of rows of data. A team of Data engineers can help you to setup these solutions.
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