Disable Wait for Network on boot
Thanks to: Nick Horn
You can shave off 10 seconds on your boot time if you diable wait for network on boot.
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Go to Raspi-config
sudo raspi-configor open Raspi-config from the Retropie Menu. -
Pick 3) Boot Options
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Pick B2) wait for Network on boot
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Pick No
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Pick OK.
Now your bootup will be 10 seconds faster and your wifi/lan connection will still work fine.