Lightroom Classic masking brush tool lagging

[Jessica22719073e8z9]

My LrC has been painfully slow with editing due to masking tools causing LrC to "not respond."  The screen goes black, then when it comes back on, the brush tool specifically will have streaked a long line across the image.  I cannot get through a single image today.  5 hours on one image and I keep having to reset, restart.  I've talked with tech support and they thought it was because my onedrive was running, but that's clearly not it. 

Please please help - everything is up to day and computer is running great! 

[dj_paige]

Try changing the graphics acceleration option: Preferences->Performance->Use Graphics Processor

If it is off, turn it on; if it is on, turn it off. Let us know if that works.