A have question about Vertexbuffer lock and unlock. A have testing one big buffer with .unlock(count) and several buffers with different sizes.
With big buffer i upload all vertex data and if there is changed pipeline or texture i upload data with unlock(count) and drawIndexed with number of indices. And have bad performance if there is many draw calls on native target, especially on android.
But when i have buffers with different sizes like 512, 1024... and choose them based on vertices count for this draw call, i have much better performance. But i have to do another step of uploading vertices in big array to count witch buffer size i need to choose.
My question is, i'm doing something wrong with one buffer approach? Cause in sources i see that native target use bufferSubData to upload vertex data. Or maybe i misunderstand how to implement batch render propertly.

"especially on android" or "only on android"? OpenGL drivers can be silly... especially on android and it can be different on different devices. Please show me some code and some numbers and some info on which devices you tested.

There is with big buffer rendering https://github.com/clay2d/clay/blob/2d4ed257860d466952397ed7257dda05632f9970/clay/render/RenderContext.hx#L360
And with different buffers
https://github.com/clay2d/clay/blob/master/clay/render/RenderContext.hx#L359

I have tested in huawei p30, and windows dx11.
I didn't have exact numbers, i will test it again without this bloated framework stuff.

I think it will be better to have isolated test. I will make it to test this.

I tested huawei p30, xiaomi redmi note 5, and pocophone f1.
Only my huawei have weird frame drops, and gain from different vertex buffer sizes.
Windows dx11 and web is perfect.
Sorry about it. Its just my phone.
There is the code if needed

That's very interesting. Every report like that helps me to get a better picture of the deficiencies of different OpenGL drivers. Thank you very much for reporting it!

So is there chance to get this fixed?
Kha is awesome, love make tools and games with it!
There is screens from huawei
On xiaomi phones its 60fps stable
One buffer

and multiple

For g4 I don't think it makes sense to attempt any kind of automatic fix for that (for g2 though it does) but when I better understand the pitfalls I can at least put together a guide about those.