[no problem] kde slow first logout corrected with 4.10.4

[sno35]

Hi
Nobody cares about trains that arrive on time ?
Since last kde update (4.10.4) the problem I've had for months with sluggish (> ~40s, can not find back my old post here) first logout went away !
May be, I should unpack this one and the previous to have a chance to learn what got it right ? For fear the problem comes back...
Anyway anyone : thank you
Edit: more evocative title.