The author mentions that in the blog. The majority is the delay of the updated file actually being written to disk by the device.

The author did not find a solution to trigger file write earlier/more frequently.

They said that, but they described it as "Several seconds", so I assumed there was plenty of other lag too.

Searching the article again, I see in the FAQ:

> Xochitl takes approximately 12 seconds to update the notebook on-disk

12 definitely isn't "several" in my understanding, but regardless, I guess there's little the author can do then.