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If you are doing lots of brushing and/or spot removal on a photo, this slowdown is a known drawback in Lightroom.
Some things you can try
- Turn off the graphics acceleration (Preferences->Performance tab->UNcheck "Use Graphics Processor")
- do the brushing and/or spot removal as the next to last editing step, and as the last step, turn on Lens Corrections and Transforms if desired
- do the brushing and/or spot removal in Photoshop or Photoshop Elements
- get a faster CPU
I did shut off the graphics acceleration already it didn't make a diffrance. The laptop is 6 months old and the i7 6700 HQ is a good processor as far as I know. this is the rig I bought
Dell XPS 15.6" 4K Touchscreen Laptop - Silver (Intel Core i7-6700HQ/1TB HDD/16GB RAM/Windows 10) - Eng
The link dont work anymore
How large in pixels are your original images? Are they RAW or JPG?
How large in pixels is the monitor on your computer?
Obviously, the processor you have (i7-6700HQ) isn't powerful enough for the task.