<s>
Lazy	B-General_Concept
loading	I-General_Concept
(	O
also	O
known	O
as	O
asynchronous	O
loading	O
)	O
is	O
a	O
design	O
pattern	O
commonly	O
used	O
in	O
computer	O
programming	O
and	O
mostly	O
in	O
web	O
design	O
and	O
development	O
to	O
defer	O
initialization	O
of	O
an	O
object	O
until	O
the	O
point	O
at	O
which	O
it	O
is	O
needed	O
.	O
</s>
<s>
The	O
opposite	O
of	O
lazy	B-General_Concept
loading	I-General_Concept
is	O
eager	O
loading	O
.	O
</s>
<s>
Prior	O
to	O
being	O
established	O
as	O
a	O
web	O
standard	O
,	O
web	B-Application
frameworks	I-Application
were	O
generally	O
used	O
to	O
implement	O
lazy	B-General_Concept
loading	I-General_Concept
.	O
</s>
<s>
One	O
of	O
these	O
is	O
AngularJS	B-Language
.	O
</s>
<s>
Since	O
lazy	B-General_Concept
loading	I-General_Concept
decreases	O
bandwidth	O
and	O
subsequently	O
server	O
resources	O
,	O
it	O
is	O
a	O
strong	O
contender	O
to	O
implement	O
in	O
a	O
website	O
,	O
especially	O
in	O
order	O
to	O
improve	O
user	O
retention	O
by	O
having	O
less	O
delay	O
when	O
loading	O
the	O
page	O
,	O
which	O
may	O
also	O
improve	O
Search	O
Engine	O
Optimization	O
.	O
</s>
<s>
Since	O
2020	O
,	O
major	O
web	O
browsers	O
have	O
enabled	O
native	O
handling	O
of	O
lazy	B-General_Concept
loading	I-General_Concept
by	O
default	O
.	O
</s>
<s>
This	O
allows	O
lazy	B-General_Concept
loading	I-General_Concept
to	O
be	O
incorporated	O
into	O
a	O
webpage	O
by	O
adding	O
HTML	B-General_Concept
attributes	I-General_Concept
.	O
</s>
<s>
There	O
are	O
four	O
common	O
ways	O
of	O
implementing	O
the	O
lazy	B-General_Concept
load	I-General_Concept
design	O
pattern	O
:	O
lazy	O
initialization	O
;	O
a	O
virtual	O
proxy	O
;	O
a	O
ghost	O
,	O
and	O
a	O
value	O
holder	O
.	O
</s>
<s>
For	O
example	O
,	O
lazy	B-General_Concept
loading	I-General_Concept
for	O
a	O
widget	O
can	O
be	O
implemented	O
in	O
the	O
C#	O
programming	O
language	O
as	O
such	O
:	O
</s>
<s>
If	O
this	O
method	O
is	O
used	O
in	O
a	O
multithreaded	B-Operating_System
application	I-Operating_System
,	O
synchronization	O
must	O
be	O
used	O
to	O
avoid	O
race	B-Operating_System
conditions	I-Operating_System
.	O
</s>
<s>
A	O
value	O
holder	O
is	O
a	O
generic	O
object	O
that	O
handles	O
the	O
lazy	B-General_Concept
loading	I-General_Concept
behavior	O
,	O
and	O
appears	O
in	O
place	O
of	O
the	O
object	O
's	O
data	O
fields	O
:	O
</s>
