Daniel Keir Haywood created CAUSEWAY-3708:
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             Summary: [Perf] Cache computed mixin values.
                 Key: CAUSEWAY-3708
                 URL: https://issues.apache.org/jira/browse/CAUSEWAY-3708
             Project: Causeway
          Issue Type: New Feature
          Components: Core
    Affects Versions: 2.0.0
            Reporter: Daniel Keir Haywood
             Fix For: 2.1.0


Sometimes the value of a mixin property is deterministic and won't change once 
computed.
 
Provide a cache to store these computed values, key being the [Bookmark, 
mixinId].

 
As a refinement, for those values that _can_ change, provide a mechanism to 
allow the mixing to act as a listener to either recompute or more likely just 
invalidate it's value from the cache.



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