Adobe Lightroom CC 2015 Really slow on exporting and woking with pictures

Hello,

   I have a client where two users use Adobe Lightroom CC 2015(Latest version) with the same setup:

HP Zbook 17

- Windows 7 pro 64bit

- 16 GB ram

- Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz

- GPU Quadro K610M

- Main Drive Samsung EVO SSD

Problem:

     When working with pictures the program runs slow(1-2 sec delay in every move they make). Longer they use the program, more slower it gets. Lightroom Exports are even more slower. I have tried every fix i found in the internet, but it didnt help. I have tried to reinstall the program, but with no avail. Those problems were'nt there when they used Lightroom 5. They cant use it anymore because the cameras are not supported in lightroom 5. So my question is, is there a way to fix it somehow or do the need new hardware to run it smoothly?