Librem 14 is really powerful machine, with actually usable touchpad, stronger WiFi and stronger GPU compared to Librem 13. However, the Qubes OS does not allow to really use that GPU power without GPU passthrough which could compromise security. One workaround solution would be to install two systems in dualboot (QubesOS + PureOS) and use PureOS for GPU-intense tasks. But then, both systems must be isolated so one potentially compromised system would not affect the other. I created a thread about this topic: Dualboot (multiboot) with isolated partitions by encryption