Pick a source, and from there it is pretty straight-forward:
- Drag and drop the dimensions & metrics you'll be using in your dataviz (quick tip here: if the original source has more fields than necessary, just pick the ones you'll use, everything has an impact on speed here!)
- Select the date field that will be used if applicable
- You can also add filters directly to your Extract Data source, so you won't have to continuously add it to every dataviz that depends on it
- Bottom right of your screen, you'll need to set-up the refresh frequency. you can pick daily, weekly or monthly and set the hour with your time zone
And that's pretty much it, your Extract Data source is ready to roll, you shouldn't suffer from latency anymore! And bonus, you can use your Extract Data source to build blended data (but again, if the objective was to make the dashboard faster, please note that blended data negatively impacts performances, so you'll need to find the right balance here).