Funnel is built to handle massive amounts of data and will scale to even the largest of use cases. That said, in order to achieve the best performance for yourself as well as for other Funnel users, we have a set of fair usage limits.
The current limits are:
Number of individual data sources per Funnel account: 1,000
Number of metrics and dimensions per Funnel account: 5,000
Number of rows processed per export file: 30,000,000
Number of rows per individual data source and day: 1,000,000
Most Funnel customers will never come close to these limits but if you find yourself at or near the limit please reach out to our support and we'll be happy to assist.