I don't think Pakistan is work hard on dealing with such threat. It is damaging the Sino-Pakistani relationship.
Well, that is your opinion & I respect it, no matter how ill-informed it may be. If you have any doubts, go through this thread:
http://www.defence.pk/forums/pakistans-war/106054-pakistani-forces-against-militants.html
The TTP has not been responsible for the violence in Xinjiang, it is responsible for aiding the Uighur terrorists in Xinjiang in the tribal areas. The ETIM initially got their support in Afghanistan, but as the WOT expanded into Pakistan, with the porous non-existential Afghan-Pakistan border, certain ETIM militants crossed into the Pakistani tribal areas, supported by the TTP (Pakistan's local insurgency). It is an extremely difficult border to contain, & Americans have problems just monitoring the Mexican-US border. Today, there is support for the ETIM from the Pakistani tribal areas, Afghanistan, & some countries in Central Asia (& Turkey).
The arena for the global WOT, Afghanistan, has had its spillover not only in Pakistan, but in many other neighboring countries as well. As long as the Pakistan Army keeps pounding the TTP hard like it has been, things will be fine.