clock regularity

[shadow2015]

Good day! Thanks for getting teensy to these crazy MHz speeds.
I'm experiencing a problem with the clock regularity every 15th bit. Between it and the next one the period is less than the set clock frequency.
I posted an extended description at the pjrc forums. Would be glad if you could look in there and give some feedback:
https://forum.pjrc.com/threads/27855-SPI-clock-regularity-with-spi4teensy3

[xxxajk]

Will be looking into this problem this summer.