Are you actually asking about PHOTOSHOP or Lightroom?
This is the Lightroom forum. Yes Lightroom's Real name is Adobe Photoshop Lightroom. But it really isn't Photoshop.
where is the photoshop forum
I've moved it from Lightroom to Photoshop for you.
Which version of Photoshop? Which operating system? What are your computer specs? Any error messages when it crashes? Can you post screenshots?