Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Ludicrous speed
Search
Sergey Vysotskiy
December 09, 2014
Technology
0
38
Ludicrous speed
Fantastic stories about performance requirements
Sergey Vysotskiy
December 09, 2014
Tweet
Share
More Decks by Sergey Vysotskiy
See All by Sergey Vysotskiy
Embracing the Imposter
ggame
0
47
Pressing Play at Spotify
ggame
0
69
Testing for capacity
ggame
2
220
Software Industry 101 (2013 season): Красочный мир тестирования
ggame
0
120
Latency
ggame
1
170
Швейцарский нож для Android
ggame
0
270
Анатомия ошибки
ggame
0
300
Other Decks in Technology
See All in Technology
実践アプリケーション設計 ③ドメイン駆動設計
recruitengineers
PRO
13
4k
『FailNet~やらかし共有SNS~』エレベーターピッチ
yokomachi
1
190
攻撃と防御で実践するプロダクトセキュリティ演習~導入パート~
recruitengineers
PRO
3
1.8k
役割は変わっても、変わらないもの 〜スクラムマスターからEMへの転身で学んだ信頼構築の本質〜 / How to build trust
shinop
0
150
AI エージェントとはそもそも何か? - 技術背景から Amazon Bedrock AgentCore での実装まで- / AI Agent Unicorn Day 2025
hariby
2
530
AWSで推進するデータマネジメント
kawanago
0
820
TypeScript入門
recruitengineers
PRO
35
11k
クラウドセキュリティを支える技術と運用の最前線 / Cutting-edge Technologies and Operations Supporting Cloud Security
yuj1osm
2
250
Figma + Storybook + PlaywrightのMCPを使ったフロントエンド開発
yug1224
10
3.6k
実践アプリケーション設計 ②トランザクションスクリプトへの対応
recruitengineers
PRO
4
1.2k
個人CLAUDE.md紹介と設定から学んだこと/introduce-my-claude-md
shibayu36
0
160
Vault meets Kubernetes
mochizuki875
0
150
Featured
See All Featured
The Cost Of JavaScript in 2023
addyosmani
53
8.9k
Evolution of real-time – Irina Nazarova, EuRuKo, 2024
irinanazarova
8
910
Building Adaptive Systems
keathley
43
2.7k
Speed Design
sergeychernyshev
32
1.1k
Agile that works and the tools we love
rasmusluckow
330
21k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
A Tale of Four Properties
chriscoyier
160
23k
Dealing with People You Can't Stand - Big Design 2015
cassininazir
367
27k
Building Better People: How to give real-time feedback that sticks.
wjessup
368
19k
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1.1k
It's Worth the Effort
3n
187
28k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Transcript
fantastic stories about performance requirements Ludicrous Speed
None
None
None
None
None
PANIC!
Modern human experimentations
None
None
Big business impact Big response delay
No silver bullets today
Perception of time What happens on internets? What is “OK”
response time? What is “OK” load? Summary PLAN
Perception of time What happens on internets? What is “OK”
response time? What is “OK” load? Summary PLAN
Perception of time What happens on internets? What is “OK”
response time? What is “OK” load? Summary PLAN
Perception of time What happens on internets? What is “OK”
response time? What is “OK” load? Summary PLAN
Perception of time What happens on internets? What is “OK”
response time? What is “OK” load? Summary PLAN
Perception Of Time
100-200 ms 500-1000 ms 2-5 seconds 7-10 seconds instantaneous reaction
uninterrupted reaction some reaction oof…
100-200 ms 500-1000 ms 2-5 seconds 7-10 seconds instantaneous reaction
uninterrupted reaction some reaction oof…
100-200 ms 500-1000 ms 2-5 seconds 7-10 seconds instantaneous reaction
uninterrupted reaction some reaction oof…
100-200 ms 500-1000 ms 2-5 seconds 7-10 seconds instantaneous reaction
uninterrupted reaction some reaction oof…
100-200 ms 500-1000 ms 2-5 seconds 7-10 seconds instantaneous reaction
uninterrupted reaction some reaction oof… *20 years old data
Modern data?
3… may be 5 seconds max
3… may be 5 seconds max Even faster in future
Weber–Fechner law 1 2
Weber–Fechner law 1 2
Weber–Fechner law 1 2
Weber–Fechner law 1 2
Weber–Fechner law 1 2 just noticeable difference (jnd)
Weber–Fechner law just noticeable difference (jnd) For time lengths of
up to 30s - jnd is somewhere between 7% and 18%
Weber–Fechner law Faster Slower
Weber–Fechner law 20s Faster Slower
Weber–Fechner law 20s 24s 16s -20% +20% Faster Slower
“Slightly” faster
Perception of average between t1 and t2 is: sqrt(t1*t2)
Example
Benchmark against 30s 60s less than 36s less than 42s
less than 24s slow same slightly slower faster
Benchmark against 30s 60s less than 36s less than 42s
less than 24s slow same slightly slower faster
Benchmark against 30s 60s less than 36s less than 42s
less than 24s slow same slightly slower faster
Benchmark against 30s 60s less than 36s less than 42s
less than 24s slow same slightly slower definitely faster
Is it worth to optimise? Target performance Unnoticeable degradation
Is it worth to optimise? Target performance Unnoticeable degradation
Is it worth to optimise? Target performance Unnoticeable degradation
Why so serious?
Why so serious?
What Happens on Internets?
None
None
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering on browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering in a browser
Response time: DNS request Establish TCP connection Generate request to
server Send request to server Server generates response Server sends response Page rendering in a browser
Fun facts! Min time to pass 1/2 of globe: 67ms
Later ;) Server generates response
Let’s talk a bit about that Page rendering in a
browser
In a complex projects 60% of time could be easily
spent on rendering
There’s space to optimise
There’s space to optimise
There’s space to optimise
Time budget: Load and render critical parts first
What Is “OK” Response?
It depends
In general case response longer than 300ms means nobody cares
In general case response longer than 300ms means nobody cares
Usually it’s more than 1 second on a client
It should be fast
It should be fast Bad requirement
It should be faster than 300ms
It should be faster than 300ms Bad requirement
Long tail
95% < 300ms 99% < 500ms
95% < 300ms 99% < 500ms
95% < 300ms 99% < 500ms OK requirement
95% < 300ms 99% < 500ms OK requirement But still
depends
Remember about 20% difference!
Remember to measure competitors!
Oof… Done with time!
Oof… Done with time! There are 1 more to go
What Is “OK” Load?
What measurement units to use?
What is “average user”?
“Average human” have less than 1 arm
Requests Per Second (RPS) is what server understands
How much RPS we should be able to handle?
EXTREMELY HARD QUESTION
Pulse of the Web
Spotify Average Monday in Stockholm
Spotify Specific Monday in Stockholm
None
None
None
None
Spotify Average Monday in Eastern US
Financial Times weekly traffic changes
Financial Times weekly traffic changes Extremely different for different clients
Financial Times weekly traffic changes Extreme daily features
Thanksgiving in US Events could make a big difference
Bombing in Moscow subway 29 march 2010
Bombing in Moscow subway 29 march 2010 First explosion 7:57
Load growth 8:10
Think like a user Look for daily/weakly/yearly cycles
Think like a user Look for daily/weakly/yearly cycles
Event based service? Prepare for extremely huge spikes
Do closed beta And watch for load profile
It’s growing
Very Short Summary
Find out what is OK response time for you Remember
about long tail Find out possible max load Test your assumptions
Find out what is OK response time for you Remember
about long tail Find out possible max load Test your assumptions
Find out what is OK response time for you Remember
about long tail Find out possible max load Test your assumptions
Find out what is OK response time for you Remember
about long tail Find out possible max load Test your assumptions
APPLAUSE
QUESTIONS?
Magic Numbers Some
4 datacenters More than 5K servers ~50 millions of unique
users More than 100 people working on backend infrastructure and operations
DATACENTERS: Ashburn San Jose Stockholm London
QUESTIONS?
Sergey Vysotskiy
[email protected]