First of all, this is not a problem (i think), this only happen when i hold the shift key (At least in a pc keyboard, i don't know if in mac is called the same)
The thing is when i'm on mission control, if i keep pressed the shift key and select and app it will bring up but very slow. This only happens with the shift, not with command nor options (alt)
I don't know if this was all the time, i discovered it in my hackintosh and with 10.9.4. Does anyone knows this? It has a function?
Video for better explanation: