LearnViz CompSci
Home / Learn / Computer Networks / Network Performance

Advanced Topic 48 of 50 Computer Networks

Network Performance

Latency, bandwidth, jitter and throughput metrics.

How it works

Network performance is described by bandwidth, the maximum data rate, latency, the delay of a packet, jitter, the variation in delay, packet loss and throughput, the rate actually achieved. Latency includes propagation, transmission, queuing and processing delays. The bandwidth-delay product determines how much data must be in flight to fill a link. Tools such as ping, iperf, traceroute and packet captures measure these.

Step-by-step walkthrough

  1. Latency is the time one packet takes to arrive.
  2. Bandwidth is the maximum capacity of the link.
  3. Jitter is the variation in latency.
  4. Throughput is the rate actually achieved, often below bandwidth.
  5. Both are needed, a wide link can still be slow if the delay is large.

Where it is used

Tuning web applications, diagnosing slow video calls, planning capacity, choosing protocols and setting service-level objectives all depend on performance metrics.

Common pitfall

Bandwidth is not the same as speed: a high-bandwidth, high-latency link can still feel slow for chatty requests. Averages hide tail latency, so look at percentiles. Bufferbloat and loss can destroy throughput even on fast links. Measure end to end, at different times, and fix the actual bottleneck instead of buying more bandwidth blindly.

Where it fits in the course

Network Performance is topic 48 of 50 in Computer Networks, rated Advanced. It follows 5G Networks. The next topic is Multicast and Anycast.

Practice and explore

How to study this topic

  1. Read the explanation above and restate the definition in your own words.
  2. Open the interactive lesson and answer its mini quiz.
  3. Read the common pitfall, then write a short example that avoids it.
  4. Check your understanding in the Computer Networks quiz, and revisit the topic if you miss a question.

Frequently asked questions

What is Network Performance?
Latency, bandwidth, jitter and throughput metrics. It belongs to Computer Networks and is an advanced-level topic.
Where do people use Network Performance?
Tuning web applications, diagnosing slow video calls, planning capacity, choosing protocols and setting service-level objectives all depend on performance metrics.
What is the most common mistake with Network Performance?
Bandwidth is not the same as speed: a high-bandwidth, high-latency link can still feel slow for chatty requests.
What should I learn before this topic?
Start with 5G Networks, the topic just before it in Computer Networks.
How can I practice it?
Answer the mini quiz in the interactive lesson, then take the Computer Networks quiz.
Is Network Performance hard to learn?
It is an Advanced topic. Expect to read the explanation more than once and to connect it with earlier topics. Working through a small example by hand helps most.
How long does it take to learn Network Performance?
Most learners can read the explanation and finish the interactive lesson in under an hour. Fluency comes from applying the idea, so plan a few short practice sessions with the quiz.
Which topics are related to Network Performance?
5G Networks, Multicast and Anycast, MPLS are closely connected. The full list is in the related topics section of this page.
What should I study after Network Performance?
Continue with Multicast and Anycast, the next topic in Computer Networks.

Related topics