> GrapheneOS also enables security features when compiling the OS that have a performance impact but mitigate security risks. They end up with a slower phone with less battery life that's protected better against extremely uncommon attack vectors.

Apps may take slightly longer to launch, which was more noticeable on older devices, but not so much on modern supported devices. I understand that some of the other exploit protections mean that apps and processes take up slightly more memory, but that's another thing that people don't seem to be affected by.

As for battery life, not really. Most people report having roughly the same battery life with GrapheneOS as with the stock OS. People who don't install Google Play report much better battery life. Sure, the exploit protections might use a small amount of extra power, but it's negligible as far as I can tell based on my own experiences and what other people report.