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# Which Problems Are Solved
The in-memory SWR promiseCache in zitadel.ts used keys like
getBrandingSettings-${org} that had no instance identifier. In
multi-tenant mode, where a single Next.js process serves multiple
instances, an instance A's cached settings without org context
(branding, languages, settings, etc.) could be served to Instance B
request without org context. The cache now additionally is bound to 100
entries by default (configurable via maxSize in `API_CACHE_CONFIG`).
When capacity is exceeded, expired entries are swept first
It additionally replaces the hand-rolled PromiseCache (Map-based, FIFO
eviction) with lru-cache, leveraging its built-in fetchMethod for
stale-while-revalidate, request deduplication, and true LRU eviction.
# How the Problems Are Solved
Added an instanceCacheKey() helpe that prefixes every cache key with
serviceConfig.instanceHost in addition to the org context if available.
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Co-authored-by: Ramon <[email protected]>