Sqlite terribly slow vs postgres with asp net core


When it comes to choosing a database for your ASP.NET Core application, performance is a crucial factor to consider. In this article, we will explore the performance differences between Sqlite and databases when used with ASP.NET Core. We will also examples and solutions to optimize the performance of Sqlite if it is running slow compared to Postgres.

Sqlite vs Postgres

Sqlite is a lightweight, file-based database that is often used for small-scale or for development and testing purposes. On the other hand, Postgres is a robust, feature-rich, and highly scalable relational database management system.

While Sqlite is known for its simplicity and ease of use, it may not perform as well as Postgres when dealing with datasets or complex queries. Sqlite's performance can be affected by factors such as disk I/O, , and indexing.

Identifying Performance Bottlenecks

If you are experiencing slow performance with Sqlite compared to Postgres, it is essential to identify the specific areas causing the bottleneck. Here are a few common areas to investigate:

1. Disk I/O

Sqlite relies on disk I/O for reading and writing data. If your application involves frequent disk I/O operations, it can significantly impact performance. Consider optimizing your queries and reducing the of disk I/O operations.

2. Concurrency

Sqlite has limited support for concurrent write operations. If your application involves multiple concurrent write operations, it can lead to contention and slow down the overall performance. Consider implementing proper mechanisms or switching to a more concurrency-friendly database like Postgres.

3. Indexing

Sqlite uses indexes to speed up query execution. Ensure that your tables have appropriate indexes on columns frequently used in queries. Missing or indexes can result in slow query performance.

Optimizing Sqlite Performance

If you have identified Sqlite as the performance bottleneck in your ASP.NET Core application, here are some solutions to optimize its performance:

1. Query Optimization

Review your queries and ensure they are optimized for Sqlite. Avoid unnecessary joins, subqueries, or complex operations. Use appropriate indexes and analyze the query execution plan to identify potential bottlenecks.

// Example of optimized Sqlite query
var result = dbContext.Orders
    .(o => o.CustomerId == customerId)
    .OrderByDescending(o => o.OrderDate)

2. Batch Operations

Instead of performing individual database operations, consider batching them together. Sqlite performs better when executing multiple operations in a single transaction. This reduces the overhead of disk I/O and improves overall performance.

// Example of batch insert using Sqlite
using (var transaction = dbContext.Database.BeginTransaction())
    foreach (var order in orders)

3. Connection Pooling

Ensure that you are using connection pooling with Sqlite. Connection pooling allows reusing existing database connections instead of new ones for each request. This can significantly improve performance by reducing the overhead of establishing new connections.


Choosing the right database for your ASP.NET Core application is crucial for optimal performance. While Sqlite may be suitable for small-scale applications, Postgres offers better performance and scalability for larger projects. If you are experiencing slow performance with Sqlite, consider optimizing your queries, using batch operations, and enabling connection pooling. By following these best practices, you can improve the performance of your ASP.NET Core application using Sqlite.

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