Lock in $30 Savings on PRO—Offer Ends Soon! ⏳

FSCKING LAG

Avatar for Secret Lab Secret Lab
September 01, 2015
Programming
0
69

FSCKING LAG

A lightning talk on multiplayer networking that we gave at /dev/world/2015.

Avatar for Secret Lab

Secret Lab

September 01, 2015
Tweet

More Decks by Secret Lab

See All by Secret Lab
Yarn Spinner - Write the Docs Portland 2016 Lightning Talk
Avatar for Secret Lab thesecretlab
0
120
How Do I Game Design?
Avatar for Secret Lab thesecretlab
0
300
Swift Functional Programming
Avatar for Secret Lab thesecretlab
0
2.6k
Open Data + Video Games = Win
Avatar for Secret Lab thesecretlab
0
340
Watch This Face
Avatar for Secret Lab thesecretlab
1
2.6k
The Mün and back - a Kerbal tale
Avatar for Secret Lab thesecretlab
0
620
How Do I Game Design? (OSCON 2015)
Avatar for Secret Lab thesecretlab
0
420
Cross-device, Cross-platform: Mobile Design Tutorial
Avatar for Secret Lab thesecretlab
0
380
Building mobile apps for IoT Devices: a case study of our work with the Holiday by MooresCloud
Avatar for Secret Lab thesecretlab
0
340

Other Decks in Programming

See All in Programming
Claude Codeの「Compacting Conversation」を体感50%減！ CLAUDE.md + 8 Skills で挑むコンテキスト管理術
Avatar for Kazuki Murahama kmurahama
1
370
マスタデータ問題、マイクロサービスでどう解くか
Avatar for Kato Keisuke kts
0
110
Flutter On-device AI로 완성하는 오프라인 앱, 박제창 @DevFest INCHEON 2025
Avatar for JaiChangPark itsmedreamwalker
1
120
AI時代を生き抜く 新卒エンジニアの生きる道
Avatar for coconala_engineer coconala_engineer
1
290
脳の「省エネモード」をデバッグする ～System 1（直感）と System 2（論理）の切り替え～
Avatar for HideyukiKitao panda728
PRO
0
100
re:Invent 2025 のイケてるサービスを紹介する
Avatar for maroon1st maroon1st
0
130
俺流レスポンシブコーディング 2025
Avatar for TAK tak_dcxi
14
8.9k
LLM Çağında Backend Olmak: 10 Milyon Prompt'u Milisaniyede Sorgulamak
Avatar for Selçuk Usta selcukusta
0
120
Rediscover the Console - SymfonyCon Amsterdam 2025
Avatar for Robin Chalas chalasr
2
170
愛される翻訳の秘訣
Avatar for Kishikawa Katsumi kishikawakatsumi
3
330
C-Shared Buildで突破するAI Agent バックテストの壁
Avatar for po3rin po3rin
0
390
Canon EOS R50 V と R5 Mark II 購入でみえてきた最近のデジイチ VR180 事情、そして VR180 静止画に活路を見出すまで
Avatar for kazuhiro hara karad
0
130

Featured

See All Featured
Git: the NoSQL Database
Avatar for Brandon Keepers bkeepers
PRO
432
66k
How STYLIGHT went responsive
Avatar for nonsquared nonsquared
100
6k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.3k
Embracing the Ebb and Flow
Avatar for Simon Collison colly
88
4.9k
Documentation Writing (for coders)
Avatar for Carmen Chung carmenintech
77
5.2k
10 Git Anti Patterns You Should be Aware of
Avatar for Lemi Orhan Ergin lemiorhan
PRO
659
61k
Bash Introduction
Avatar for André Augusto Costa Santos 62gerente
615
210k
The Psychology of Web Performance [Beyond Tellerrand 2023]
Avatar for Tammy Everts tammyeverts
49
3.2k
jQuery: Nuts, Bolts and Bling
Avatar for Doug Neiner dougneiner
65
8.3k
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
58
6.2k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
31
2.6k
Navigating Team Friction
Avatar for Lara Hogan lara
191
16k

Transcript

  1. None

  2. FSCKING LAG

  3. Video Games!

  4. Multi-player video games!

  5. Server

  6. Server Client Client Client

  7. Server Client Client Client

  8. Server Client

  9. Server Client “I just killed player 1”

  10. Server Client “I just killed player 1” “ok”

  11. Server Client “I just killed player 1” “ok” BAD

  12. Server Client “I pressed these buttons” “This is where things

    are”

  13. Server Client “I pressed these buttons” “This is where things

    are” BETTER

  14. PROBLEM

  15. 1 2 Lag = 1 second Lag = 0.1 seconds

  16. 1 2 Shoots! Runs! FROM PLAYER 1’S PERSPECTIVE:

  17. Server Player 1 Player 2

  18. Server Player 1 Player 2 “I’m shooting!” (1 second ago)

  19. Server Player 1 Player 2 “I’m shooting!” (1 second ago)

    “I’m running around the corner!” (0.1 second ago)

  20. Server Player 1 has shot, and Player 2 is around

    the corner. Player 1’s shot missed.

  21. Server Player 1 Player 2 “Player 2 is now around

    the corner. Player 1 shot, but missed.”

  22. Counter-Strike

  23. Server Player 1 shot, and at the time, they were

    aiming at Player 2. Their should would have hit.

  24. Server Player 1 Player 2 “Player 1 shot Player 2.”

  25. Server Player 1 Player 2 “Player 1 shot Player 2.”

    “Oh, and Player 2 still ran around the corner. lol.”

  26. Server Player 1 Player 2 “Player 1 shot Player 2.”

    “Oh, and Player 2 still ran around the corner. lol.” wtf

  27. Age of Empires

  28. 1500 Archers on a 28.8: Network Programming in Age of

    Empires and Beyond Mark Terrano, Paul Bettner

  29. PROBLEM: 1500 archers Each one has a position Each one

    is moving

  30. Each position is about 4 bytes each

  31. 4 bytes ✕ 1500 = 6000 bytes

  32. 6000 bytes ✕ 30 frames/sec = 175 kB/s

  33. SOLUTION:

  34. DON’T SYNC STATE

  35. SYNC PLAYER INTENT

  36. Client Client Client

  37. Client Client Client “I told my archers to move.”

  38. Client Client Client “I told my archers to move.” “I

    told a villager to gather wood.”

  39. Client Client Client Wait for everyone to finish this frame….

  40. Client Client Client Archers are moving, and the villager is

    gathering wood.

  41. NOT PERFECT

  42. RUNS AT THE SLOWEST PLAYER

  43. DESYNCS

  44. @thesecretlab rocketboxgame.tumblr.com