Random dots - pretty much normal. I get them every time, but the screen is usually cleared straight away so I don't see but a flicker upon startup.
Speed out in the weeds - maybe... 18F is probably a bit less than twice as efficient as a 16F at the same clock speed. You're running 20Mhz vs. 40Mhz. Still that's only 4x difference at the very most.
The init process on my setup takes about 2 seconds, give or take...and that's a big give or take...
Me thinks you've got something wrong with your OSC settings...
Time for a 1 second blinky LED test...
Just a thought here...
40 seconds to start up..............
DEFINE'd OSC 20Mhz vs DEFINE'd OSC 40Mhz, 2x difference = 4 seconds
PIC18F vs PIC16F, 2x difference = 8 seconds
Actually running at 4Mhz vs. 20Mhz... 5x difference = 40 seconds...
2 x 2 x 5 = 20x difference = 40 seconds vs 2 seconds...
Something to think about...
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