Tableau Data Extracts are snapshots of data optimized for aggregation and loaded into system memory to be quickly recalled for visualization. Extracts tend to be much faster than live connections, especially in more complex visualizations with large data sets, filters, calculations, etc.
You can yourself see by choosing Live Vs Extract (one by one) and observe the performance.
You can also try Performance recording Create a Performance Recording & decide for yourself
Please mark the answer as CORRECT & HELPFUL if it really helps you so that it can help others as well
Thank you for the reply.
I understand that Extracts are faster.
What I'm wondering is, if I have five extracts all joined in Tableau, would it be wise to create an extract of all them to get one super data set or if its faster having a live connection to all five of the extracts. One super set means that they're already pre-joined into one extract, or if I leave them as five individual extracts will tableau get the benefit still because its having to join them and query across them?