the same day you answered me I had just finished to restore the juicyads banners...
Fortunately, I created a script that allows me to add and remove them from all my sites in a snap.
Anyway, I left them online a few days, and seamstress coincidence, but my sites have begun to lose visits, 5-10% of missed visits in a few days.
I try to remove them and see what happens in the coming days.
But at least in my case I don't think is a problem of juicyads, but weighing and processing speed of pages, adding the banner naturally they increase.
Thanks for the answers