I have the same problem with the lag when using rotate or reflect (when I use the alt-key to change the center of rotation or reflection). It's not just that it's slow, sometimes it takes a good 30 seconds and then when it kicks in, it sets the point of rotation wherever the pen/cursor happens to be at that point, so it's never right. The problem happens immediately after starting AI. I found a simple solution that worked for me ... in Illustrator, just hit Ctrl+E once and see if that fixes the problem. If not (or if it causes other problems/slowdowns), just change it back by hitting Ctrl+E again. I have an HP Envy laptop with an NVidia card, 16GB ram, a wacom tablet, windows 8.1 pro-64 bit, and Adobe CC with Illustrator fully updated. My drivers are also fully updated. I even reinstalled/updated windows, so the system is clean with no conflicting software. I tried changing the power management for Illustrator in the nvidia control panel 3D settings for Illustrator. I tried it using every option in the dropdown menu for the Power Management Mode, but none of them fixed the problem. I did, however, find 4 different solutions that solved this specific problem for me. 1. Use the trackpad when using reflect/mirror and rotate. This worked, but it is too inconvenient going back and forth between the pen and the trackpad, plus it's difficult to get the same accuracy when selecting a point. 2. Uncheck GPU performance in the Illustrator preferences. This fixed the problem immediately, but this also disabled the animated zoom feature, and I find that feature to be really useful. 3. In the nVidia control panel, click Manage 3D settings, and in the Program Settings Tab, select Adobe Illustrator for #1 and select Integrated Graphics for #2, then hit Apply. Restart Illustrator. Now, in the Illustrator preferences, it says that the drivers for one of my graphics cards is not up to date (even though I am using the latest available drivers for both the nVidia & my integrated graphics), but it seems to work just fine. The lag problem is fixed and I have the animated zoom. 4. In Illustrator, under the View menu, click GPU preview (or just use the shortcut Ctrl+E). I no longer have the lag when using rotate or reflect and I am still able to use the animated zoom. I assume that this essentially did the same thing that #3 did, but I set it from Illustrator instead of the nVidia control panel. I don't know what other effects this has on my performance in Illustrator, but for my use, I don't notice any other problems and I don't have to give up the animated zoom. Solution # 4 is by far the quickest fix - seriously, all you have to do is hit Ctrl+E in Illustrator. Then try rotate and see if it works properly. If it doesn't, then change it back to how it was by hitting Ctrl+E again and try the other solutions. Of the other solutions, I would suggest #3 unless you notice that it somehow degrades the performance of Illustrator in some other way - again, the reason I prefer this is because I can still use animated zoom. If #3 causes other problems, switch back to using the nVidia and just disable the GPU performance in the Illustrator settings (#2) - you will lose animated zoom, but you may not even care about that. I like it, and I figured there must be some setting that fixes the problem, so I set out to find out it. This may not be the actual fix, but it is a workaround that allows me to use the features that I like.
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