WEBVTT

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Why can a website feel slow on a fast connection?

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Delay and data-transfer capacity are different parts of the journey.

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Understand two speed factors.
6 latency and bandwidth basics.

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Latency is the delay
It describes how long a response or transfer takes to begin or travel.
Travel delay · Response delay · Waiting time

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Bandwidth is capacity
It describes the amount of data a connection can carry over time.
Transfer capacity · Data per second · Connection limit

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Large files need more transfer
Heavy images and downloads can take longer on limited connections.
Large images · Video files · Download size

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Many requests can add work
Several dependent requests may introduce repeated waits.
Request sequence · Dependency chain · Added waiting

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Real conditions vary
Distance, congestion and device work affect the experience too.
Network route · Busy connection · Device performance

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Test the customer experience
Review important pages on realistic devices and connections.
Loading delay · Transferred data · Usable page result

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Your checklist
Latency is the delay · Bandwidth is capacity · Large files need more transfer · Many requests can add work · Real conditions vary · Test the customer experience

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Measure the delay and the amount of data.
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