Network connectivity is considered a system resource because it determines a computer's ability to communicate with other systems and access remote resources and services, like the Internet or networked storage. The speed (bandwidth) and quality (latency, jitter) of the network connection can significantly affect a computer's functionality. For instance, a high-speed, low-latency network is essential for online gaming, video conferencing, and streaming high-definition videos, where delays or interruptions can degrade the user experience. Similarly, in environments like cloud computing or remote desktop applications, network speed impacts how quickly data can be transferred between the computer and the server, influencing overall system responsiveness and performance.

Cache memory in a CPU is a small, extremely fast memory designed to speed up the process of accessing data from the primary memory (RAM). The primary function of cache memory is to store instructions and data that are frequently accessed by the CPU, thus reducing the time to retrieve data from the main memory. Cache memory is faster than RAM but is also more expensive, which is why it's smaller in size. It's typically divided into three levels (L1, L2, and L3), with L1 being the smallest and fastest. In contrast, RAM is larger and slower but serves as the main memory space for running applications and storing the data that is currently in use. The effective use of cache memory can significantly enhance the overall speed and efficiency of a computer system by minimizing the delay in data retrieval and processing.

Screen resolution, the number of pixels displayed on the screen, directly affects a computer's graphic processing. Higher resolutions, such as 4K, require the Graphics Processing Unit (GPU) to calculate and render significantly more pixels than standard resolutions like 1080p. This increased load can impact performance, particularly in graphics-intensive tasks such as gaming or 3D modelling. Higher resolutions demand more computing power and memory bandwidth from the GPU, often resulting in a lower frame rate or the need for more advanced, powerful graphic hardware. Therefore, while a high resolution provides a sharper and more detailed image, it also places greater demands on the system’s graphics resources.

Increasing the RAM in a computer system can significantly improve the performance of software applications, particularly those that are memory-intensive. More RAM allows a computer to store more operational data, like application files and processes, in a quickly accessible space. This capability is crucial for multitasking and running large applications like video editors, games, or virtual machines. When a system runs out of RAM, it starts using the much slower hard disk or SSD for data, leading to performance lags or stuttering. Therefore, more RAM can enable smoother operation, faster application responses, and better handling of complex tasks without frequent recourse to disk-based virtual memory.

The type and speed of a hard drive have a significant impact on a computer system's overall performance. Hard Disk Drives (HDDs) use mechanical parts and magnetic storage, which makes them generally slower in read/write speeds compared to Solid-State Drives (SSDs). SSDs use flash memory and have no moving parts, leading to faster data access times, lower latency, and quicker boot times. The speed of these drives is measured in terms of their data transfer rate: SSDs can drastically improve system responsiveness, application loading times, and file transfer rates. For tasks involving frequent disk access like video editing or gaming, SSDs offer a noticeable performance enhancement over HDDs. Moreover, SSDs are more durable and have a lower failure rate due to their lack of mechanical parts.