If the secure OS had the same development velocity as the OEM profit OS, the secure OS would be much better optimized than it currently is and likely much much

If the secure OS had the same development velocity as the OEM profit OS, the secure OS would be much better optimized than it currently is and likely much much more secure, too. Android and iOS are optimized in general and for example Google or Samsung also optimize and distribute it for specific hardware. GrapheneOS is not well funded and has little influence in hardware development. The development of Graphene from AOSP is pretty much guaranteed to de-optimize it in the short term. While there is little about mobile that would cause a secure OS to be noticably slower, much less mature software with many fewer deployments is expectedly less optimized.