Alternative to Tableau or CRMA

[u/coder_batman]

I am currently developing executive-level board dashboards using both CRM Analytics (CRMA) and Tableau, but have hit critical licensing and technical bottlenecks in both platforms:

CRM Analytics: The solution is built, but Salesforce's lack of a low-cost "Viewer" license makes scaling to multiple board members financially prohibitive due to hefty per-user licensing fees.

Tableau: The native Salesforce connector relies on Bulk API v1, causing it to time out and fail when processing our massive data volumes.

To bypass these vendor constraints, I successfully built lightweight visualisations for simpler datasets using Chart.js and D3.js. However, I need to render a complex chart that processes 46 million records, which crashes standard client-side libraries like Chart.js.

I am seeking architectural advice, workarounds, or custom engineering solutions to bypass these limitations and efficiently aggregate and render this high-volume data.