Feature Request: DoHeatmap is slowly,may be faster

[Liripo]

Motivation

Doheatmap drawing takes more than 5 seconds

Feature Description

I found it very slow when running Doheatmap, and found that the main reason was that it was slow to get the gene name of scale.data

code is

seurat/R/visualization.R

Line 268 in f8ae979

possible.features <- rownames(x = GetAssayData(object = object, slot = slot))

My scale.data has 2w gengs, 4w cells. Get only the gene name, which should be faster.

Alternatives

No response

[Liripo]

Can it be directly changed to：

possible.features <- Features(x = object, layer = layer)