I’ve been tweaking multiple options in the rPi3b+ for performance. I finally settled for just overclocking the sdcard by modifying the /boot/config.txt file. I have shaved the image transfer speed down to 3-4 seconds from 5-6 seconds when shooting RAW, NOT saving to SDcard and transfering native. When transferring fits I’m down to 17 seconds from 28.

Overall performance of the pie has increased as well. Opening KSTars has gone from watching it load slowly to almost instant. Switch screens or opening menu is snappy and responsive.

Overclocking anything can cause stability issues so do this at you own risk. I manage to brick my pie more than once before i finally figured it out.

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