I try to connect the new data source to the existing reports, but it takes so long (about 15 minutes to make the connection), it even stops. I have more than 150 reports to modify, and without a fast connection, it’s just impossible. Is there anything we can do?
You mean Looker Studio right? In general, creating the new data source shouldn’t take 15 minutes, so it’s a bit worrying.
Are you using the latest version of the connector? You can follow the installation guide here and it should provide you with the latest version. If that doesn’t work, let me know which exact step is causing this long connection time.
As a side note, once you set up a data source (e.g. through the Piwik PRO connector), you should be able to use it in different reports.