5d mk2 vs 20d (what people mean slow af on 5d mk2?)

hi
Just ordered a 5d mk2 to replace my 4 years old 20d.

After reading a lot on slow af i want to question people that had or have both cameras.
Is the 5dmk2 slower than the 20d ?
what is slower ? AF ? saving to file ? what ?

20d was more the enough speed for me, i'm upgrading because i had good selling opp of the 20d and wanted ff since i bought the 20d 4 years ago.
And the video is also a requirement (small videos).

Thanks for your advice.