I have never run my MacBook Pro in anything but the default scaling resolution. Quantum has been and continues to be a nightmare on my device. Unusably slow performance with high CPU utilization and occasionally spiking CPU utilization to 100% for prolonged periods. Usually long enough that I am forced to reboot the laptop.
Unfortunately, a non-native scaling mode is the default on new Mac laptops now. You need to switch to one of the custom scaling modes to get a true, native 2x.