Tubeless2720 Everyone is missing my point here.
I don't even use lock screen on my phone. I am not even bit worried about physical security.
I live in a random village somwhere and I am not bothered about someone copying all the data since my phone is unlocked all the time and I don't have important data on my phone. That is not my threat model.
I believe the defenses that GrapheneOS uses against physical attacks on device data mostly do not cost performance, so turning those off won't make the phone faster. For example, the automatic reboot timer does not slow the phone down at all; wrapped storage keys do not slow the phone down; disabling the USB-C port when the screen is locked does not slow the phone down.
The defenses that cost performance are mostly defenses against apps, whether deliberately or due to remote exploit, stealing your data (and thus compromising your privacy), or web sites breaking in to the browser and exfiltrating data (thus compromising your privacy).
Finally, the main optional defenses against invasive commercial tracking do cost performance: things like VPNs and ad blocking (though ad blocking can also be a performance boost in net, because some ads are resource-heavy). The main fuel for behavioral tracking by "big tech" is interacting with their apps or web sites: what you post, what you read/watch, what times of day you're active, etc.