Changing only part of a Material2d and efficient update on GPU

[Droggelbecher]

I'm using the AsBindGroup derive macro to create a custom Material2d. Let's say for simplicity it has a uniform and a large storage buffer. Updating that large buffer frequently is obviously expensive, but luckily in my application it changes only rarely.

Now, the issue is that even if I just update the uniform, it seems bevy will still do a full reupload of the storage buffer.
So my questions are:

• What are my options to address this?
• Can I somehow use 2 different bind groups for a single material? Would that change anything?
• Alternatively, can I somehow use two materials for the same shader somehow?
• How is decided what gets reuploaded to the GPU each frame, can I influence that more directly?

I'm currently working around this with putting the "small" data into vertex attributes, needless to say this is non-ideal, as I have to duplicate it for each vertex.

Thanks in advance for any pointers :)