If you have constant, multiple, concurrent writes on a non-append-only database, it is bound to perform poorly no matter what database you pick. SQLite in this case nicely points out that you probably have a major architectural issue in your application.

On more productive notes:

* Are you using WAL mode?

* Are you using Batch inserts/updates/upserts?

* Are you using `BEGIN IMMEDIATE` when you need DML? Suddenly upgrading from autocommit mode or `BEGIN DEFERRED` "DQL" transactions to `BEGIN IMMEDIATE` "DML" ones implicitly by suddenly starting DML on what used to be a sequence of DQL queries is bad on any database, but worse on SQLite;