I have a custom board that is patterned after a Pro Mini
It uses an external 8 MHz crystal and an ATMega328 (not the P version)
It is being programmed via SPI using a Pro Mini board
These are the settings for the board from boards.txt
pro.menu.cpu.8aMHzatmega328=ATmega328 (3.3V, 8 MHz lcd)
The problem is that Delay() is operating as if the Clock is running at 1MHz. In other words, it is 8x slower than expected. I have interrupts turned off and carefully isolated the delay function so that I am confident that nothing else is influencing the timing. I set delay to delay(10000) - 10 seconds and measure 80 seconds with a stopwatch. This is why I am speculating that the processor fuses are incorrect. I think low fuses = 0xFF should not invoke the /8 clocking.
I get the same results with two different boards.