[Libguestfs] Help: host system got very slow when run guestfish

Hi there, Recently, I got a strange phenomenon, when I run: ./run guestfish -a xxx.img -a xxx.img My host system got to be very very slow for several minites, sometimes can`t even move my mouse. I am not sure what I have done made it this way. How should I investigate this issue? Because I don`t see anyone got this kind of problem in FAQ Thanks in advance. Yours Sinerely, Pino Tsao