Opening slowly and crashing while processing photos

[michaelb19023526]

Lightroom Classic CC is taken about 2 minutes to open and when it opens when I am processing photos using brushes it freezes then crashes stating in the top beside Lightroom "Lightroom not responding" followed by a black screen then returns this continues 

[GoldingD]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut out as that is just so much dead space to us non-Techs and it takes up vast amounts of scroll space making the reply less readable and less likely that others will bother with your post.