Github user aljoscha commented on the pull request:
    I will have to rework this now that the support for registering Types and 
Serializers at Kryo was merged.
    The POJO subclass with tagging is slower because we do additional checks 
and lookups: Upon serialisation we perform a map lookup to check whether the 
subclass is actually a registered class. When deserialising we have to fetch 
the correct subclass serialiser from an array of subclass serialisers.

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