Traded up from a 5D MKII to a 5D MKIV memory card question

pcs wrote in post #19487226
That's not normal. Do you use mirror lock-up, DLO, High ISO noise reduction or something like that? Card speed only matters when the buffer is full, not for the first pictures.

Maybe total reset if bought second hand.

Rob-P wrote in post #19488258
Update, I might reset, but in the meantime, my other problem has been resolved.
When I took a shot using anything except A+, the cycle time between shots was about 4 seconds.
This was due to
Lens aberation correction > Digital lens optimiser = ON

This slows down picture taking time, turn it off again (no idea why it was on anyway) finger on the shutter brrrrrap, shot after shot after shot.
Sorted.

Raised a ticket with Canon as according to P150 of the manual, it reads as if I can do what I want. re the focus lighting up red.
I'll post a definitive reply here in case anyone is interested.