Hello! I’m working on a detailed piece (Mac, desktop), and each time I select an object, select the fill color then eyedropper, I experience a lag. Not a big deal here or there but it happens every time and add that up over multiple hours and it’s super frustrating.
You’ll see after selecting the eyedropper, the magnification circle pauses and during that time, I can’t move the cursor.
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Do you get the same lag if you skip the part of going to the Inspector and the Color Fill, and just use the keyboard shortcut Control-C instead?
Hey @dkcBIG, welcome to the forum! 
We are aware of some latency when bringing up the Eyedropper tool in some Documents which have many elements/Artboards. Our team currently gathering all the cases to better understand the issue and see if there are any improvements we can make to the tool.
Would it be possible for you to share with us a sample Document we can add to your case? This is so the team can inspect the Document and replicate the behavior as you are seeing it on your end. You can email us the Document (or a URL to it) to productsupport@sketch.com. 
Edit: Document received, thank you so much!