Why does Photoshop do this?

Adobe. I am working in Lightroom. I fire up Photoshop as I want to go there to do some cleaning up work, but in the length of time it takes for Photoshop to load it keeps on appearing on my screen, interrupting my work in Lightroom.

Please can this be fixed? 

I do not need/ want Photoshop taking over whatever I am doing on my PC while it loads?? 

Rick McEvoy Photography