[simonw]

SQLite requires writes run sequentially. Most SQLite write operations take single digit milliseconds or even microseconds. If your writes are inexpensive (inserting or updating single small rows) you'll probably never even notice the queue.

[zarzavat]

Exactly, people confuse "doesn't scale" with "is a bottleneck". There's many applications whereby hitting the limits of SQLite is either a physical impossibility, or implies that the application has achieved success such that replacing SQLite is the least of anyone's problems.

I visited a piano store once that was running everything off MS Access. If only they had switched to HA technologies, they would be able to sell millions of pianos a day!