> 2- 16F628 + 4mhz XTAL

In that AN607 I pointed you to, there's a little something
that may help you decide

Under Table 3, page 3 it says

"32kHz crystals have a typical start-up time of 1-2 seconds.
Crystals >100kHz have a typical start-up time of 10-20ms.
Resonators are typically <1ms"

However, I'd want independent verification that the crystal
I was using takes that long to get revved up

In Table 3, start-up time for the PIC itself is shown as 1024
Tosc whether it be crystal or resonator

So, if it's true you have an unavoidable overhead of at least
10ms when using a crystal, change to a resonator if possible

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