Calls from OverrideConfiguration to parentConfiguration cause unnecessary overhead.

[marcus-talbot42]

Much like the OverrideField, calls to the parentConfiguration cause unnecessary overhead, due to the depth of the call tree. As the result of those calls are not cached in a field, in contrast to the OverrideField where every value was cached, the overhead is potentially higher.

The solution would be to introduce fields in the OverrideConfiguration for every field that is retrieved from the parentConfiguration, and fill those fields on initialisation of the OverrideConfiguration.