My app is loading slowly on one low end device

I submitted my app for testing on the android developer console. It is an offline reading app that does not need to access the internet. It has been optimized and performs well on most devices, however, the performance report shows that my app has a (slow) cold start on one device, the Nokia nokia 1. From my research, this phone has low specifications.
Can any ionic/angular developer tell me if this normal?

You shouldn’t be supporting older devices.