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Lazy Loading
conceptPerformance Pattern
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Overview
Use casedefers initialization of objects until they are needed
Also see
Alternative to
Eager Loading
Based onProxy Design Pattern
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Claims185
Avg confidence91%
Avg freshness100%
Last updatedUpdated 18 days ago
WikidataQ1772028
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Lazy Loading

concept

Design pattern that defers initialization of data until it's actually needed to improve performance

Compare with...

categorized as

ValueTrustConfidenceFreshnessSources
software design pattern○UnverifiedHighFresh1

applies to

ValueTrustConfidenceFreshnessSources
image loading○UnverifiedHighFresh1
Images○UnverifiedHighFresh1
database queries○UnverifiedHighFresh1
JavaScript modules○UnverifiedHighFresh1
Database records○UnverifiedModerateFresh1

documented in book

ValueTrustConfidenceFreshnessSources
Patterns of Enterprise Application Architecture by Martin Fowler○UnverifiedHighFresh1

use case example

ValueTrustConfidenceFreshnessSources
image loading in web pages○UnverifiedHighFresh1
loading database relationships on demand○UnverifiedHighFresh1

primary use case

ValueTrustConfidenceFreshnessSources
defers initialization of objects until they are needed○UnverifiedHighFresh1
Deferred loading of resources until needed to improve performance○UnverifiedHighFresh1
Loading data or objects on-demand rather than at initialization to improve performance○UnverifiedHighFresh1
deferring initialization of objects or loading of data until needed○UnverifiedHighFresh1
Deferring initialization of objects until they are actually needed○UnverifiedHighFresh1
Defers initialization of objects or data until needed to improve performance○UnverifiedHighFresh1
Defers initialization of objects or loading of data until needed to improve performance○UnverifiedHighFresh1
Defers loading of data until it is actually needed to improve performance○UnverifiedHighFresh1
deferred initialization of objects or data until needed○UnverifiedHighFresh1
Deferring initialization of objects or resources until they are actually needed○UnverifiedHighFresh1
deferring initialization of objects until needed to improve performance○UnverifiedHighFresh1
defers loading of resources until they are needed to improve performance○UnverifiedHighFresh1
Defers initialization of objects or loading of data until actually needed○UnverifiedHighFresh1
Deferring initialization or loading of resources until they are actually needed○UnverifiedHighFresh1
defers loading of related objects until they are actually accessed○UnverifiedHighFresh1
Defers initialization of expensive resources until they are actually needed○UnverifiedHighFresh1
Reducing initial load time and memory consumption○UnverifiedHighFresh1
Memory optimization in large datasets○UnverifiedHighFresh1

contrast pattern

ValueTrustConfidenceFreshnessSources
eager loading○UnverifiedHighFresh1

featured in book

ValueTrustConfidenceFreshnessSources
Patterns of Enterprise Application Architecture○UnverifiedHighFresh1

use case category

ValueTrustConfidenceFreshnessSources
Performance Optimization○UnverifiedHighFresh1

supported by language

ValueTrustConfidenceFreshnessSources
Java○UnverifiedHighFresh1
C#○UnverifiedHighFresh1
Python○UnverifiedModerateFresh1

commonly used in

ValueTrustConfidenceFreshnessSources
Web development for images and content○UnverifiedHighFresh1
Object-Relational Mapping (ORM) frameworks○UnverifiedHighFresh1
Object-oriented programming for object initialization○UnverifiedHighFresh1
web development○UnverifiedHighFresh1
mobile applications○UnverifiedHighFresh1
Object-Relational Mapping (ORM)○UnverifiedHighFresh1
Mobile app development○UnverifiedHighFresh1
mobile application development○UnverifiedHighFresh1
Web development for image loading○UnverifiedModerateFresh1
object-relational mapping○UnverifiedModerateFresh1
Object-Relational Mapping frameworks○UnverifiedModerateFresh1

html attribute

ValueTrustConfidenceFreshnessSources
loading="lazy" for img and iframe elements○UnverifiedHighFresh1
loading="lazy"○UnverifiedModerateFresh1

primary benefit

ValueTrustConfidenceFreshnessSources
improves performance by reducing memory usage○UnverifiedHighFresh1

improves metric

ValueTrustConfidenceFreshnessSources
Initial page load time○UnverifiedHighFresh1
Memory usage○UnverifiedHighFresh1

programming paradigm

ValueTrustConfidenceFreshnessSources
Design Pattern○UnverifiedHighFresh1

implements principle

ValueTrustConfidenceFreshnessSources
Deferred Execution○UnverifiedHighFresh1

supports language

ValueTrustConfidenceFreshnessSources
Python○UnverifiedHighFresh1
Java○UnverifiedHighFresh1
C#○UnverifiedHighFresh1
JavaScript○UnverifiedHighFresh1

performance benefit

ValueTrustConfidenceFreshnessSources
Reduces memory usage and startup time○UnverifiedHighFresh1
Reduces initial page load time○UnverifiedHighFresh1
Reduces memory usage and initialization time○UnverifiedHighFresh1
Conserves memory by avoiding unnecessary resource allocation○UnverifiedHighFresh1
reduces initial query execution time○UnverifiedHighFresh1

commonly applied to

ValueTrustConfidenceFreshnessSources
images○UnverifiedHighFresh1
JavaScript modules○UnverifiedModerateFresh1
database queries○UnverifiedModerateFresh1

used in

ValueTrustConfidenceFreshnessSources
Web development for image loading○UnverifiedHighFresh1
Object-Relational Mapping frameworks○UnverifiedHighFresh1

pattern type

ValueTrustConfidenceFreshnessSources
Design Pattern○UnverifiedHighFresh1
Performance optimization pattern○UnverifiedHighFresh1
Object-Relational Behavioral Pattern○UnverifiedHighFresh1
object-oriented design pattern○UnverifiedHighFresh1
creational design pattern○UnverifiedHighFresh1

published in

ValueTrustConfidenceFreshnessSources
Patterns of Enterprise Application Architecture○UnverifiedHighFresh1

alternative approach

ValueTrustConfidenceFreshnessSources
Eager Loading○UnverifiedHighFresh1

reduces

ValueTrustConfidenceFreshnessSources
memory consumption○UnverifiedHighFresh1
initial page load time○UnverifiedHighFresh1
initial bandwidth usage○UnverifiedHighFresh1

commonly used with

ValueTrustConfidenceFreshnessSources
Object-Relational Mapping○UnverifiedHighFresh1

use case scenario

ValueTrustConfidenceFreshnessSources
Loading related database records on demand○UnverifiedHighFresh1

benefits include

ValueTrustConfidenceFreshnessSources
Improved application startup time○UnverifiedHighFresh1
reduced memory usage○UnverifiedHighFresh1
Reduced memory consumption○UnverifiedHighFresh1
faster application startup time○UnverifiedHighFresh1

implemented in framework

ValueTrustConfidenceFreshnessSources
Hibernate ORM○UnverifiedHighFresh1
Hibernate○UnverifiedHighFresh1
Entity Framework○UnverifiedHighFresh1

use case

ValueTrustConfidenceFreshnessSources
Web image loading optimization○UnverifiedHighFresh1
Database query optimization○UnverifiedHighFresh1

implemented in

ValueTrustConfidenceFreshnessSources
Hibernate ORM○UnverifiedHighFresh1
JavaScript○UnverifiedHighFresh1
C#○UnverifiedHighFresh1
Java○UnverifiedHighFresh1
Entity Framework○UnverifiedHighFresh1
Django ORM○UnverifiedHighFresh1
Python○UnverifiedHighFresh1
ActiveRecord○UnverifiedHighFresh1
Modern web browsers for images and iframes○UnverifiedModerateFresh1

improves

ValueTrustConfidenceFreshnessSources
application performance○UnverifiedHighFresh1
initial page load time○UnverifiedHighFresh1

supported by framework

ValueTrustConfidenceFreshnessSources
React○UnverifiedHighFresh1
Hibernate○UnverifiedHighFresh1
Entity Framework○UnverifiedHighFresh1
Angular○UnverifiedHighFresh1
Django ORM○UnverifiedHighFresh1
Vue.js○UnverifiedModerateFresh1

native browser support

ValueTrustConfidenceFreshnessSources
HTML loading attribute○UnverifiedHighFresh1

integrates with

ValueTrustConfidenceFreshnessSources
Object-Relational Mapping (ORM) frameworks○UnverifiedHighFresh1
Hibernate○UnverifiedHighFresh1
Hibernate ORM○UnverifiedHighFresh1
Object-Relational Mapping frameworks○UnverifiedHighFresh1
React.lazy○UnverifiedHighFresh1
Entity Framework○UnverifiedHighFresh1
Spring Framework○UnverifiedModerateFresh1
JavaScript frameworks○UnverifiedModerateFresh1
Django ORM○UnverifiedModerateFresh1
Intersection Observer API○UnverifiedModerateFresh1
React.js○UnverifiedModerateFresh1
Vue.js○UnverifiedModerateFresh1

supported by

ValueTrustConfidenceFreshnessSources
Hibernate ORM framework○UnverifiedHighFresh1
React framework○UnverifiedHighFresh1
HTML native loading attribute○UnverifiedModerateFresh1
Angular framework○UnverifiedModerateFresh1
Hibernate ORM○UnverifiedModerateFresh1
Entity Framework○UnverifiedModerateFresh1

implements in

ValueTrustConfidenceFreshnessSources
Java programming language○UnverifiedHighFresh1
C# programming language○UnverifiedHighFresh1
Python programming language○UnverifiedModerateFresh1

improves performance metric

ValueTrustConfidenceFreshnessSources
Initial Load Time○UnverifiedHighFresh1

also known as

ValueTrustConfidenceFreshnessSources
lazy initialization○UnverifiedHighFresh1
On-demand loading○UnverifiedHighFresh1

design pattern type

ValueTrustConfidenceFreshnessSources
Creational and Performance Optimization Pattern○UnverifiedHighFresh1
creational design pattern○UnverifiedModerateFresh1
Proxy pattern implementation○UnverifiedModerateFresh1

pattern category

ValueTrustConfidenceFreshnessSources
Object-Relational Behavioral Pattern○UnverifiedHighFresh1

documented by

ValueTrustConfidenceFreshnessSources
Martin Fowler○UnverifiedHighFresh1
Martin Fowler in Patterns of Enterprise Application Architecture○UnverifiedModerateFresh1

used for

ValueTrustConfidenceFreshnessSources
database query optimization○UnverifiedHighFresh1

supported by browser

ValueTrustConfidenceFreshnessSources
Chrome (native lazy loading attribute)○UnverifiedHighFresh1
Firefox (native lazy loading attribute)○UnverifiedHighFresh1

improves performance by

ValueTrustConfidenceFreshnessSources
reducing memory usage and startup time○UnverifiedHighFresh1

appears in

ValueTrustConfidenceFreshnessSources
Patterns of Enterprise Application Architecture○UnverifiedHighFresh1

reduces resource usage

ValueTrustConfidenceFreshnessSources
Memory Consumption○UnverifiedHighFresh1

related to

ValueTrustConfidenceFreshnessSources
Proxy design pattern○UnverifiedHighFresh1
proxy pattern○UnverifiedModerateFresh1

supports programming paradigm

ValueTrustConfidenceFreshnessSources
Object-Oriented Programming○UnverifiedHighFresh1

memory benefit

ValueTrustConfidenceFreshnessSources
reduces initial memory consumption○UnverifiedHighFresh1

natively supported by

ValueTrustConfidenceFreshnessSources
modern web browsers○UnverifiedModerateFresh1

related to pattern

ValueTrustConfidenceFreshnessSources
Proxy Pattern○UnverifiedModerateFresh1
Virtual Proxy Pattern○UnverifiedModerateFresh1

implemented by framework

ValueTrustConfidenceFreshnessSources
Hibernate ORM○UnverifiedModerateFresh1
Entity Framework○UnverifiedModerateFresh1

commonly implemented in

ValueTrustConfidenceFreshnessSources
Single Page Applications (SPAs)○UnverifiedModerateFresh1
C#○UnverifiedModerateFresh1
Java○UnverifiedModerateFresh1
JavaScript○UnverifiedModerateFresh1

implementation variants

ValueTrustConfidenceFreshnessSources
Lazy Initialization, Virtual Proxy, Value Holder, Ghost○UnverifiedModerateFresh1

solves problem

ValueTrustConfidenceFreshnessSources
N+1 query problem in object-relational mapping○UnverifiedModerateFresh1

implemented using

ValueTrustConfidenceFreshnessSources
proxy objects○UnverifiedModerateFresh1

implements strategy

ValueTrustConfidenceFreshnessSources
Value Holder○UnverifiedModerateFresh1
Virtual Proxy○UnverifiedModerateFresh1
Ghost○UnverifiedModerateFresh1

potential drawback

ValueTrustConfidenceFreshnessSources
Can cause N+1 query problem in databases○UnverifiedModerateFresh1
N+1 query problem in database operations○UnverifiedModerateFresh1
delayed first access time○UnverifiedModerateFresh1
N+1 query problem in database access○UnverifiedModerateFresh1

related pattern

ValueTrustConfidenceFreshnessSources
Eager Loading○UnverifiedModerateFresh1

javascript library example

ValueTrustConfidenceFreshnessSources
Intersection Observer API○UnverifiedModerateFresh1

requires concept

ValueTrustConfidenceFreshnessSources
Virtual Proxy Pattern○UnverifiedModerateFresh1

requires

ValueTrustConfidenceFreshnessSources
Proxy objects or virtual proxies○UnverifiedModerateFresh1

related concept

ValueTrustConfidenceFreshnessSources
eager loading○UnverifiedModerateFresh1

based on

ValueTrustConfidenceFreshnessSources
Proxy Design Pattern○UnverifiedModerateFresh1
Proxy Pattern○UnverifiedModerateFresh1

common implementation

ValueTrustConfidenceFreshnessSources
virtual proxy○UnverifiedModerateFresh1

implementation pattern

ValueTrustConfidenceFreshnessSources
Virtual proxy○UnverifiedModerateFresh1
Value holder○UnverifiedModerateFresh1

described in

ValueTrustConfidenceFreshnessSources
Gang of Four Design Patterns book○UnverifiedModerateFresh1

native support in

ValueTrustConfidenceFreshnessSources
HTML loading attribute○UnverifiedModerateFresh1

supports model

ValueTrustConfidenceFreshnessSources
Virtual Proxy implementation○UnverifiedModerateFresh1

addresses problem

ValueTrustConfidenceFreshnessSources
N+1 Query Problem○UnverifiedModerateFresh1

supports protocol

ValueTrustConfidenceFreshnessSources
HTTP lazy loading○UnverifiedModerateFresh1
HTTP/2 Server Push○UnverifiedModerateFresh1

alternative to

ValueTrustConfidenceFreshnessSources
Eager Loading○UnverifiedModerateFresh1

benefits

ValueTrustConfidenceFreshnessSources
Reduced memory usage and faster initial load times○UnverifiedModerateFresh1

requires careful management of

ValueTrustConfidenceFreshnessSources
Database connections and transactions○UnverifiedModerateFresh1

Alternatives & Similar Tools

Eager Loading
alternative to
Compare

Commonly Used With

Object-Relational Mapping (ORM) frameworksHibernateHibernate ORMObject-Relational Mapping frameworksReact.lazyEntity FrameworkSpring FrameworkJavaScript frameworksDjango ORMIntersection Observer APIReact.jsVue.js

Related entities

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Claim count: 185Last updated: 4/23/2026Edit history