Series for visualizing a large dataset having over 100k data items.

### What problem does this feature solve?
I am struggling to find a series for drawing a set of over 100k rectangular elements and map the visual map to their values.
It should look like the heat map series but it can support value axes.
I have tried the following series but none of them worked as what I expected:
- Heat map series does not support value axes.
- Custom series has a terrible performance when holding my dataset. I could not even zoom in when using the custom series.
- ScatterGL has a performance as what I expected but it does not support the way to draw the point using axes unit size.

Is there any other series that I could use to fulfill my requirement?

### What does the proposed API look like?
I expect a series having the same performance as the scatter GL and supporting drawing element in axes unit size as what the custom series does.