Do splitters or chargers that offer “dual” inputs compromise charging speed?

I am looking at this car charger that has two USB A inputs on back to allow me to charge 3 devices at once, as I often charge my phone while also charging vape or headlamp. I was concerned this would divide the charging capacity 3 ways, or compromise it in any way?

https://www.amazon.com/Certified-Charger-Aymla-Cigarette-Lightning/dp/B0D3PK72V5