Execution Speed of LayerData & co.

[vertesy]

Dear Seurat Team,

I am using object properties to annotate plots in my Seurat.utils package.

I noticed that the proper way to access data slots seem to be very slow:

> tic(); nrow(LayerData(obj, assay = "RNA", layer = "scale.data")); toc();
[1] 2000
1.323 sec elapsed

## Compared to
> tic(); nrow(obj@assays$RNA@layers$scale.data); toc();
[1] 2000
0.001 sec elapsed

Speed matters if you call this at every UMAP, and you plot 30 genes (DGEA).

Is there any suggestion how to use your suggested approach and maintain speed?
Or did I misunderstood the use case / instructions?

Thank you,
Abel