You should know who caches what and how to cache it. There are so many aspects to consider. Bottomline: You need to know your system and what you are doing!

1. Hard Caching
Follow me on Twitter
@bennimack

2. About myself
• Cache Grinder
• Cash Cow
• Cage Conversion Rater
• Performance Performer

3. Pronouncing Cache
CashKasch
Cache /ˈkæʃ/ = Käsch
Cage
Casché
Cach
Czech
Katsching

4. Caching in a nutshell
• Caching is bad
• Not caching is even worse
• Clearing your caches is a workaround
• Clear your caches - or... know what you're doing

5. Why does it matter?

6. It becomes my problem
Client changes something in TYPO3, change does
not show in the frontend
vs.
Client complains the site is slow

7. Why should we cache?

8. Why should we cache
• Serve data faster that other needs lot of
processing, memory, IO
• Saves the environment! Saves lives!
• Main issue: Get it under control

10. Caches everywhere
• CDN
• Browser caches
• Server caches
• PHP caches
• TYPO3 caches
• Database caches
• Memory caches

11. CDN

12. Browser Cache
Request /products/game-boy-retro/
Response: Valid for 24h
Cache-Control: public
E-Tag: 7eac52c37675360243068dffc49e9351
Expires: 24hs

13. Browser Cache - 2nd time
Request /products/game-boy-retro/
Response:
You already have it ("ETag")

14. Browser Cache
Request /products/secret-weapon/
Response: You only get it now
Cache-Control: private
Pragma: no-cache

15. Browser Cache
Request /products/secret-weapon/
Response: You only get it now
Cache-Control: private
Pragma: no-cache

16. Browser Cache
Request /products/secret-weapon/
Response

17. Things can change
• Clear your browser cache?
• Not the problem in the first place
• Ensure that your browser knows what to cache

18. Things can change
• Just add the tstamp so the browser caches
different variants
<link rel="stylesheet" type="text/css"
href="/typo3conf/ext/site_for_drevil/Resources/
Public/Css/main.css?1499248117">

19. Developers?

21. First Hit vs. Cached Hit

22. TYPO3 Cache - First Hit
Request /products/pampers/
Response
Heavy lifting

23. TYPO3 Cache - Second Hit
Request /products/pampers/
Response
Done here

24. About cHash
• Variant of the page that gets a separate cache
entry
• Depends on the additional GET variants
• Some parameters can be excluded in TYPO3

25. no no no_cache=1

26. Remember: Save .env

27. Some things should
never be cached

29. 10 minutes
1 day - 7 daysno_cache!
2 minutes

30. Caching Framework

31. Caching Framework - Backends
• APC
• Database
• Filesystem (NFS, HDD, SDD)
• Redis, Memcached

32. Caching Framework - Part 2
• cache_core (PHP code = files)
• cache_hash
• cache_pages
• cache_pagesection
• cache_rootline

33. Caching Framework - Part 3
• fluid_template (It's PHP = Files)
• extbase_object (Small => APCu)
• extbase_reflection (Small => APCu)
• extbase_datamapfactory_datamap (Small =>
APCu)

34. Lessons learned
• Fix the issue, not the symptom
• Save the environment
• Don't cache forever, it will bite you
• Know your system, what it does
• Never use no_cache=1

35. Go and save goats
... and don't forget to follow me on
twitter @bennimack