Infrastructure upgrade in Odoo is a process of improving the underlying hardware, software, and network components of your Odoo installation. This can be done to improve performance, security, scalability, and reliability.

Improved performance: With a more powerful infrastructure, your Odoo installation will be able to handle more data and traffic, resulting in faster performance. This is especially important for large businesses with complex Odoo installations.

Improved security: A well-maintained infrastructure is less vulnerable to security attacks. When you upgrade your infrastructure, you can also implement the latest security features and updates.

Improved scalability: If you plan to grow your business, you will need an infrastructure that can scale with you. Upgrading your infrastructure can help you to avoid performance bottlenecks and other issues that can arise when you add more users and data to your Odoo installation.

Improved reliability: A reliable infrastructure will help to ensure that your Odoo installation is always available to your users. This is especially important for businesses that rely on Odoo for critical operations.