The latency is not as low as other settings but at leat It works ![Evil >:D](https://www.eevblog.com/forum/Smileys/default/xevil.gif.pagespeed.ic.tdrs7Uj5gu.png)
Congratulations!
I'm sure, on EP, there was some sort of small thing you somehow overlooked.
Roughly 60 ns (if judging by the 1/2 voltage level). I would expect it to be a little bit better. Is the CPU running at 100 MHz (200 MHz Fosc)? Have you used the dedicated INT pin (pin #19) for the signal?
Anyway, this is way faster than you would get with the interrupt.