[Sirupsen]

We spent a fair amount of time trying to get this executing fast on SQL. However, with spreadsheets you recursively compute a lot of values. You can do this in SQL with recursive CTEs, but it’s slow, they’re not optimized for this. They also of course won’t do smart caching and dependency management for the cache. Fundamentally, it’s possible, but then we’d need to start hacking on a DB engine to make it work as a sheet. We concluded it’s better to continue on our existing engine.