Object storage sizes

I have been working with an interaction forest (`intaus`) on 2000 observations that consists of the default 20000 trees (from package diversityForest). This forest uses 306 682 KB disk space. I have applied `Interaction$new` and `FeatureEffects$new` to that forest and stored the resulting objects on disk (R work spaces with a single object each). I end up with the following stored object sizes:
```
hilf <- Predictor$new(intaus, data=as.data.frame(yx2[,-1]), y=yx2[,1], predict.function=predfun)
hilf2 <- Interaction$new(hilf)
## storage size is 1 227 232 KB
fes <- FeatureEffects$new(hilf)
## storage size is 1 248 226 KB
```
To me, these sizes appear excessive. I wonder what functionalities of these objects I might miss that justify these huge object sizes. Or would it perhaps be possible for `Interaction$new` and `FeatureEffects$new` to return smaller objects without sacrificing functionality?

Best, Ulrike