What does latency mean in software engineering?

Latency is the time delay between when a request is sent and when a response is received. In software engineering, it is a key performance metric that measures how fast a system responds to user actions or data requests. Lower latency means better user experience.

How is latency different from bandwidth?

Latency is about speed of response (how fast), while bandwidth is about data capacity (how much). You can have high bandwidth (lots of data flowing) but still have high latency (slow response). Think of a highway: bandwidth is the number of lanes; latency is how fast the cars travel.

What is a good latency value?

It depends on the application. For most web applications, under 100-200ms is acceptable. For real-time applications like gaming or video conferencing, under 50ms is preferred. Financial trading systems might require sub-10ms latency. Teams define their own SLAs based on user needs.

How do you use latency in a sentence at work?

You can say 'We need to reduce latency on this API endpoint' or 'The database latency is too high' or 'Low latency is critical for this feature.' Always use latency as a noun or with action verbs like reduce, optimize, measure, or increase.

Is latency formal or informal?

Latency is a formal, technical term used in professional tech environments. It is appropriate for meetings, documentation, code reviews, and interviews. Informal alternatives like 'lag' or 'slowness' are less precise and should be avoided in professional settings.

latency meaning in tech — Speak Tech English

Commonness	5/5
Versatility	5/5
Formality	CasualFormalFormal
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓We need to reduce latency across the network.

✓This feature has high latency issues.

✓Low latency is critical for real-time performance.

Real examples

in a standup

"We identified a latency problem in the payment service and it is now down to 50 milliseconds."

in a code review

"Adding a database index should help us cut latency on this query by half."

in a team meeting

"Our SLA requires latency under 200ms for all API calls, so we need to optimize the middleware."

Don't say this

Handle with care. Do not confuse latency (delay in response time) with bandwidth (amount of data transferred). Latency is about speed of response, not capacity.

✕We have a latency problem with our bandwidth.

✓We have a latency problem with our response time or We have a bandwidth problem with our data throughput.— Latency and bandwidth are different concepts. Latency is delay; bandwidth is capacity.

✕The server is too latency.

✓The server has high latency or The server is experiencing latency issues.— Latency is a noun, not an adjective. Use latency as a noun or use the adjective form with 'high' or 'low'.

✕We latency the system yesterday.

✓We optimized latency in the system yesterday or We reduced latency yesterday.— Latency is not typically used as a verb. Use verbs like optimize, reduce, increase, or measure with latency as the object.

Other forms

noun

latency

"Network latency is affecting our user experience."

adjective

high latency / low latency

"We are seeing high latency on the database queries."

verb phrase

reduce / optimize / measure latency

"We need to reduce latency to meet our performance targets."

Often used with

high latencyIndicates slow response time or delay

low latencyIndicates fast response time, desirable in most systems

reduce latencyCommon action taken by engineers to improve performance

latency issueA problem causing noticeable delays

network latencyDelay caused by data traveling across networks

database latencyDelay in querying or retrieving data from a database

API latencyResponse time of an API endpoint

Similar words

delayMore general term; latency is more specific to technical systems

response timeOften used interchangeably; response time is slightly more user-focused

lagMore casual; used in gaming and user-facing contexts

Opposites

speedthroughput

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your API is responding slowly. How do you phrase the issue?

We have high latency in the API.We have a latency problem.The API is very latency.The API latency is bad.

Complete the sentence

2. Our database queries are causing _______ that is affecting user experience.

Spot the mistake

3. Which sentence uses latency incorrectly?

We measured network latency at 45 milliseconds.We need to latency the system before launch.Reducing latency is a priority for this quarter.The payment service has unacceptable latency.

Rewrite naturally

4. Rewrite this using latency: 'The system takes a long time to respond when users click the button.'

Questions

Quick poll

Have you said "latency" in a standup this week?

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