Which of these features is NOT typically associated with the FAT file system?

The FAT (File Allocation Table) file system is known for its simplicity and compatibility across various operating systems, which underscores its widespread use and standardization. It features a straightforward structure that allows for easy file organization and access, making it suitable for lightweight applications.

However, regarding reliability under heavy loads, the FAT file system does not typically excel. It can become fragmented and less efficient with many write operations or when handling large amounts of data, which can lead to performance issues. This is why reliability under heavy load is not a characteristic associated with FAT.

Robust performance in lightweight implementations is indeed a feature of FAT, as it performs well in scenarios with fewer resources. The standardization across different operating systems also works in its favor, as many systems support FAT, thereby enhancing its utility.