Thick client

A thick client, also known as a fat client, is a computer or software application that performs most of its processing locally rather than relying heavily on a central server. Unlike thin clients, which depend on servers for computing power, a thick client has its own operating system, storage, and processing capabilities. This allows it to function even when disconnected from a network, making it more self-sufficient.

Thick clients are commonly used in enterprise environments, where applications require significant processing power, offline access, or rich user interfaces. Examples include desktop applications like Microsoft Office, CAD software, or locally installed enterprise resource planning (ERP) tools.

Advanced

Thick clients typically manage business logic, data processing, and application execution locally, while only syncing with a server for data storage or updates. This architecture reduces the server’s workload but requires more powerful end-user devices.

Advanced thick client systems often support synchronization protocols, local caching, and distributed computing to ensure consistent performance across networks. Security is managed both locally and centrally, requiring endpoint protection and patch management. Compared to thin clients, thick clients consume more resources and require higher maintenance but provide greater autonomy and functionality.

Relevance

• Provides robust performance by leveraging local processing power.
• Supports offline use, which is critical in certain industries.
• Offers richer user experiences compared to thin clients.
• Reduces dependency on constant server connectivity.
• Used in scenarios requiring specialized or resource-intensive applications.
• Balances enterprise IT strategies between flexibility and central management.

Applications

• Engineering firms using CAD software installed directly on workstations.
• Healthcare providers running medical imaging software locally.
• Financial analysts using desktop applications for complex modeling.
• Universities deploying lab PCs with thick client setups.
• Businesses operating ERP systems with local processing capabilities.

Metrics

• Processing speed and performance of local applications.
• System uptime and ability to operate offline.
• Cost of hardware acquisition and maintenance.
• Frequency of synchronization errors with central servers.
• User satisfaction and productivity compared to thin client setups.

Issues

• Higher hardware and software costs per device.
• Increased complexity in updates, patches, and maintenance.
• Greater security risks if endpoints are not properly managed.
• Scalability challenges in large organizations.
• May create data consistency issues if offline synchronization fails.

Example

An architectural firm deployed thick client workstations to run 3D modeling software locally. This enabled high-performance rendering and offline project work, but required significant investment in powerful hardware and regular updates. The firm balanced this by using central servers for collaboration and data storage.