Memory cache for shared hosting

For the benefit of the discussion and of the general public:

Ref NC 16 Docs » Nextcloud configuration » Memory caching

Nextcloud supports multiple memory caching backends, so you can choose the type of memcache that best fits your needs. The supported caching backends are:

  • APCu, APCu 4.0.6 and up required.
    A local cache for systems.

  • Redis, PHP module 2.2.6 and up required.
    For local and distributed caching as well as transactional file locking.

  • Memcached
    For distributed caching.

Memcaches must be explicitly configured in Nextcloud by installing and enabling your desired cache, and then adding the appropriate entry to config.php
[…]

Note: […] Nextcloud supports only the memcached PHP module.

Hope this helps.