How can I test a mobile design before implementation into code?

I'm working on a mobile app with a team of designers and I want to be able to test the mobile design on my phone and see what if feels like. I'm a startup founder with a big focus on product UI/UX and want to make sure the experience is amazing.
I tried using Figma prototype and it's incredibly slow and sluggish and it doesn't really give me the right experience similar to what the app will feel like when coded.
What is the best way to test and experience this?