In my experience it also depends on the worker type, if you are running sync you might need more workers depending on how much your database can handle.
Otherwise the number of workers might limit the total throughput quite severely.
Always interesting to test out a new productivity app in the search of the perfect solution :-) Looks promising! Really like the clean layout.
A bit of feedback: (maybe a bug?) when I tried to add new tasks to "Today", tasks added after the first task did not have the current date set and therefore did not show up. (At first it seemed like saving tasks did not work.)
Big fan of BorgBase (the other product by the same company), I have been using them for quite some time for different projects.