Best way to visualize huge amount of data

Question

I have a data set of around 3M row. I has only 2 category (category- 2:1 ratio). Now i want to visualize(scatter plot) it's distribution to understand can the data linearly separable or not(In order to choose model type).I already try this and the plot is not understandable. What will be the best way to visualize this data set?