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IMQA ???
???? ???
??? ???? ? ???? ????
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1. ??? ?? ??
2. Core Web Vitals
3. Largest Contentful Paint(LCP)
4. Cumulative Layout Shift(CLS)
5. First Input Delay(FID)
6. Interaction to Next Paint(INP)
??(ÐÔÄÜ)
?? ??? ?? ???? ??
?? + ??
APM
(Application Performance Monitoring)
Pinpoint
Scouter
APM(Application Performance Monitoring)
?? ??
?? ??
Slow Query
CPU
Memory
APM(Application Performance Management)
NEXACRO
(https://www.tobesoft.com/product/nexacro)
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
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If you can¡¯t measure it,
You can¡¯t manage it.
If you can¡¯t measure it,
You can¡¯t improve it.
Peter Drucker
??? ????? ???
FID SI LCP CLS FCP
TTFB TTI TBT
?? ?? ?? ?? ? ??
??? ????? ???
?? ????? ??? ??.
?? ?? ?? ?? ? ??
? ??? ???? ??
???? ??? ??.
?? ?? ?? ?? ? ??
?? ?? ???? ??
??? ??? ??
Core Web Vitals
(CWV)
Loading
Response to
Interactions
Visual
Stability
Loading
(????)
Response to
Interactions
(??? ???)
Visual
Stability
(??? ???)
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
Core Web Vitals(CWV)
- 2020? 5? 8? ??
- ?? ????? ????? ????? ??
- ?? ???? ?? ??? ??? ??
- ?? ?? ??
- 2021.06.15 ??? ??
- 2022.02.22 ???? ??
Chrome User Experience Report(CrUX)
???? ?? ??
28??? ??
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
0
2.5
5
7.5
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
??
0
2.5
5
7.5
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
??
75???
0
2.5
5
7.5
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
??
0
2.5
5
7.5
10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
??
95???
Largest contentful Paint
(LCP)
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
???
Good
Need
Improvement
Poor
2.5s 4s
Largest Contentful Paint(LCP)
1? ¡®?? ??¡¯
Information Visualizer, an Information Workspace
Stuart K. Card , George G. Robertson , Jock D. Mackinlay
Largest Contentful Paint(LCP)
Largest Contentful Paint(LCP)
<img> ??
<svg> ?? <image> ??
??? ???? ?? <video> ??
CSS? url() ??? ?? ?? ? ??? ?? ??
text? ??? block ?? ??
LCP ?? Content? ???? ??
LCP ?? Contents ? ?? ?? ??
????? 0? ??
?? ???? ?? ??
????? ???? ???? ??
LCP? ?? ??? ??? ??? ?????
Padding
Over
ow
300px
200px
(Original 400px)
(Original 300px)
LCP ?? ??? ???
LCP ?? ??
LCP ?? ??
??? ?? ?? ??
LCP ?? ??
??? ?? ?? ??
LCP ?? ??
??? ?? ?? ??
LCP ?? ??
??? ?? ?? ??
<img fetchpriority="high" src=/slideshow/devkon202312-v01pdf/265370758/"/light/0604/214.png"
LCP ?? ??
??? ?? ?? ??
<link rel="preload" fetchpriority="high" as="image"
href=/slideshow/devkon202312-v01pdf/265370758/"/light/0604/214.png" type="image/png">
LCP ?? ??
??? ?? ?? ??
LCP ?? ??
??? ?? ?? ??
??? ?? ?(6ms)
??? ?? ?(2ms)
LCP ?? ??
??? ?? ??
LCP ?? ??
??? ?? ??
LCP ?? ??
??? ?? ??
LCP ?? ??
TTFB ????
LCP ?? ?? ??
Performance Navigation Timing
?? ??
?? ??
TTFB - ???? ???? ?????? ???? ??
?? ??
CDN
(Content Delivery Network)
?? ??
Caching
?? ??
Redirection ???
?? ??
103 early hint ??
?? ??
103 early hint ??
?? ??
103 early hint ??
?? ??
Client Server
Cumulative Layout Shift
(CLS)
Cumulative Layout Shift(CLS)
???
Cumulative Layout Shift(CLS)
Good
Need
Improvement
Poor
0.1 0.25
CLS? ??? ??????
?? ??? ?? ??? ?? ?? ??
impacted fraction(?? ??)? distance fraction(?? ??)? ??? ?? ??
?? ? ?? ???? ??
CLS? ??? ??????
Impacted Fraction(?? ??)
50%
CLS? ??? ??????
Impacted Fraction(?? ??)
50%
25%
50%
75% = 0.75
CLS? ??? ??????
Distance Fraction(?? ??)
25%
25% = 0.25
CLS? ??? ??????
Layout Shift ?
Impacted * Distance
= 0.75 * 0.25
= 0.1875
CLS? ??? ??????
CLS ?? ? ???? ??
??? ?? ??? ??? ?? ??
??? ??? 500ms ??? ???? ??(hadRecentInput)
animation? transition
CLS ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
CLS? ?? ?? ??? ?? ??
?? ??
CLS? ?? ?? ??? ?? ??
First Input Delay
(FID)
First Input Delay(FID)
First Input Delay(FID)
First Input Delay(FID)
First Input Delay(FID)
First Input Delay(FID)
???
Good
Need
Improvement
Poor
100ms 300ms
First Input Delay(FID)
The Perception of Causality
Michotte 1962
First Input Delay(FID)
50ms
First Input Delay(FID)
100ms
First Input Delay(FID)
200ms
DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf
Interaction to Next Paint(INP)
Interaction to Next Paint(INP)
???
Good
Need
Improvement
Poor
200ms 400ms
Interaction to Next Paint(INP)
????(Interaction)???
???????
INP ? ?? ?? ??? ??
???? ???? ?? ??
??, ?, ???? ??? ??(hover, scroll)
?? ??? ??
Body text (36pt)
????? ???
????? ???
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DEVKON_202312_????????? ?????? ??????? ?????????? ????????????? ???????v.01.pdf