Hi;
I assume you run your build on x server, not a framebuffer like SDL. I also assume you have set the drivers correctly. Issues can be many, most probably electron's chromium component built without opengl es support.
I can fix the problem. I can also build a minimal buildroot image that boots under few seconds with added performance for an extra fee. Please give me detailed info what you've done (like the rpi image you're using-like you are using raspian or a custom-made linux os)
We can discuss details, and if you have questions, I'm here to answer. (Please post your questions though I may appear offline)
Best regards.