T108620 has brought a new bug : while not clicking on blue points, my CPU was used at 100% (of one core only).
Once I have watched both pop-ups, CPU use become normal again.
It seems to be only the visual effect, because if I change tab in my browser, the CPU use become normal again whereas VE still turns. (and if I come again on wiki tab the CPU resume to turn max.
I use Iceweasel 41.0.2 (Debian 8.2 ; LXDE)
(sorry for my bad English)