This extension to Entity Framework Core adds a Set<TContext, TEntity> method to IDbCOntextFactory<TContext>. This allows you to easily execute multiple queries in parallel without the need to write complex code, or a lot of using blocks or statements. You can stick to all your known methods from IQueryable<TEntity>. As the context is disposed after your query is executed, all results will obviously not be tracked and disconnected from any DbContext.
$ dotnet add package EntityFrameworkCore.ParallelNo README available.