Salesforce Data Source Where Clause?

Hi nrawlins were you able to find a solution? As a workaround, maybe you can try to test your connection with a 3rd party connector, which pulls data directly from SF objects API and lets you pre-filter the data on the tool's UI. This means you can export filtered data to PBI based on what you need and this would improve your report's performance. I've tried windsor.ai, supermetrics and funnel.io. I stayed with windsor because it is much cheaper so just to let you know other options. In case you wonder, to make the connection first search for the Salesforce connector in the data sources list:

After that, just grant access to your Salesforce account using your credentials, then on preview and destination page you will see a preview of your Salesforce fields:

There just select the fields you need. It is also compatible with custom fields and custom objects, so you'll be able to export them through windsor.  Finally, just select PBI as your data destination and finally just copy and paste the url on PBI --> Get Data --> Web --> Paste the url.