The slower speed of the SanDisk Extreme Pro SSD in the external enclosure could be due to compatibility issues or firmware differences between the SSD and the enclosure. Even though both use USB-C, the original SanDisk enclosure might have optimizations or proprietary technology that enhances performance, which the external enclosure lacks.
Low GPU and CPU usage coupled with FPS dips could be related to power management settings or potential bottlenecks in your system. Double-check the power settings in both your operating system and the NVIDIA control panel, ensuring they’re set to ‘High Performance’. Also, consider if there might be other bottlenecks, like RAM or storage speed.