Lesson Notes By Weeks and Term v5 - Grade 11

Lesson Video

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Performance objectives

• Identify common causes of system slowdowns.
• Apply basic troubleshooting methods.
• Monitor system performance using built-in tools.
• Implement techniques to improve system speed.
• Explain the importance of regular maintenance.

Lesson summary

This week, we delve into the crucial area of system technologies, specifically focusing on performance and troubleshooting. In today's technologically driven world, understanding how to optimize system performance and diagnose problems is not just a useful skill for IT professionals; it's becoming increasingly vital for everyday life. From ensuring smooth online access for educational resources to keeping small businesses running efficiently, this knowledge empowers you to navigate and contribute to the digital landscape of South Africa. A slow computer or network can hinder access to education, delay important communication, and limit economic opportunities.

Lesson notes

2.1 Understanding System Performance System performance refers to how efficiently a computer or network performs its intended tasks.

Key performance indicators (KPIs) include: Speed: How quickly tasks are completed. Measured in clock speed (GHz), processing time, etc.

Responsiveness: How quickly the system reacts to user input (mouse clicks, keyboard presses).

Throughput: The amount of data processed per unit of time (e.g., Mbps for network speed).

Stability: The system's ability to run reliably without crashing or freezing.

Resource Utilization: How efficiently the system uses its resources (CPU, memory, disk space). High resource utilization can indicate bottlenecks. 2.2 Common Causes of Performance Degradation Hardware Bottlenecks: Insufficient RAM: When the RAM is full, the system uses the hard drive as virtual memory, which is much slower. Imagine trying to prepare a big meal in a tiny kitchen; you run out of space quickly, and everything takes longer.

Slow Hard Drive: A traditional hard drive (HDD) is significantly slower than a solid-state drive (SSD). A slow drive delays loading programs and accessing files. Think of it as trying to read a book written in very tiny font; it takes ages to get through it.

Underpowered CPU: A slow CPU cannot handle demanding tasks quickly, resulting in lag and slowdowns. Like trying to push a car up a steep hill on your own.

Inadequate Graphics Card: Especially for gaming and graphics-intensive applications.

Software Issues: Malware/Viruses: Consume system resources and interfere with normal operation.

Bloatware: Unnecessary pre-installed software that slows down the system. Often found on new laptops and computers. Imagine buying a new car and finding it already filled with junk you didn't ask for.

Outdated Drivers: Incompatible or outdated drivers can cause hardware malfunctions and performance issues. Drivers are like translators between your hardware and software, outdated ones can lead to miscommunication.

Fragmented Hard Drive: Files are stored in non-contiguous blocks, slowing down access times. (Less relevant for SSDs)

Too Many Startup Programs: Programs that launch automatically at startup consume resources even when not in use.

Operating System Issues: Corrupted system files, outdated OS versions, and incorrect configurations. 2.3 Troubleshooting Methodologies A systematic approach to troubleshooting is crucial: Identify the Problem: Clearly define the symptoms (e.g., "My computer is running very slowly when opening web pages").

Gather Information: Note when the problem occurs, what programs are running, and any recent changes to the system.

Formulate a Hypothesis: Based on the information gathered, propose possible causes (e.g., "My internet connection might be slow").

Test the Hypothesis: Try solutions based on the hypothesis (e.g., run a speed test, restart the router).

Evaluate the Results: Did the solution fix the problem? If not, refine the hypothesis and try another solution.

Document the Solution: Record the steps taken to resolve the issue for future reference. 2.4 System Monitoring Tools Task Manager (Windows): Provides real-time information about CPU usage, memory usage, disk activity, and network activity. (Press Ctrl+Shift+Esc)

Activity Monitor (macOS): Similar to Task Manager, it displays system resource usage.

Resource Monitor (Windows): A more detailed version of Task Manager, providing granular information about resource usage. (Search for "Resource Monitor")

Third-Party Utilities: Tools like CCleaner, Malwarebytes, and system monitoring software can provide additional insights and features. 2.5 Optimization Techniques Disk Defragmentation: (HDDs only!) Reorganizes files on the hard drive to improve access times.

Disk Cleanup: Removes temporary files and unnecessary data to free up disk space.

Uninstall Unnecessary Programs: Remove bloatware and programs you no longer use.

Disable Startup Programs: Prevent unnecessary programs from launching at startup. (Task Manager -> Startup tab)

Update Drivers: Keep drivers up-to-date to ensure optimal performance and compatibility.

Run Malware Scans: Regularly scan your system for malware and viruses.

Upgrade Hardware: Consider upgrading RAM, hard drive (to SSD), or CPU if necessary.

Reinstall Operating System: A fresh install can often resolve persistent performance issues. (Use as a last resort and back up important data first!) 2.6 Worked Example 1: Slow Web Browsing Problem: A student in Cape Town reports that their internet speed is very slow when browsing websites for research.

Troubleshooting Steps: Identify the Problem: Slow web browsing.

Gather Information: The problem occurs on all websites, but only during peak hours (after school). Other devices on the same network also experience slow speeds.

Formulate a Hypothesis: The internet service provider (ISP) might be experiencing congestion during peak hours. The Wi-Fi signal strength might be weak. There might be too many devices on the network.