Use Redis or Memcached cache backends for optimizing certain caches that has tags which become slow with lots of content in Neos – Included in https://speakerdeck.com/aertmann/tasty-recipes-for-every-day-neos

Caches.yaml

# Redis (has to be configured to different databases on shared hosting)
TYPO3_TypoScript_Content:
  backend: TYPO3\Flow\Cache\Backend\RedisBackend
  backendOptions:
    defaultLifetime: 0

Flow_Mvc_Routing_Resolve:
  backend: TYPO3\Flow\Cache\Backend\RedisBackend
  backendOptions:
    defaultLifetime: 0

Flow_Mvc_Routing_Route:
  backend: TYPO3\Flow\Cache\Backend\RedisBackend
  backendOptions:
    defaultLifetime: 0

# Memcached (fits shared hosting)
TYPO3_TypoScript_Content:
  backend: TYPO3\Flow\Cache\Backend\MemcachedBackend
  backendOptions:
    defaultLifetime: 0
    servers:
      - '127.0.0.1:11211'

Flow_Mvc_Routing_Resolve:
  backend: TYPO3\Flow\Cache\Backend\MemcachedBackend
  backendOptions:
    defaultLifetime: 0
    servers:
      - '127.0.0.1:11211'

Flow_Mvc_Routing_Route:
  backend: TYPO3\Flow\Cache\Backend\MemcachedBackend
  backendOptions:
    defaultLifetime: 0
    servers:
      - '127.0.0.1:11211'
      
# Example of configuring different database for redis
TYPO3_TypoScript_Content:
  backend: TYPO3\Flow\Cache\Backend\RedisBackend
  backendOptions:
    database: 1