Try this, edit your sys.txt file. The only line in this file should be sdcardpath="\\SDMMC\\" or whatever your device names the sdcard. My 2 din started up slowly before after i edited the sys.txt file it starts up in less than 10 seconds. Let me know if it works.
start the unit, pull out your sd card, turn the unit off, hit the reset button ( somewhere on the front), pull out the fuses ( one for radio accessories and the other is the radio power), wait 30 seconds, re-install the fuses back and make sure they are the right amperage, start the unit, you might have to redo all your settings for your unit again, GPS1966 is correct with the sys.txt file, sometimes the more you put in the slower it goes, and for anyone trying to have primo 1.2 and igo 8.x.xx good luck, they conflict, even when you tell primo not to look for a second root ( in the sys.txt) it still might.