We have done what we can - but we cannot reproduce the slowdown problem on any of our systems. So we have no idea why you are slowing down on your system. We've seen OS bugs with trackpads and tablets cause some lag (that's pretty widely discussed here and on Apple's forums), and that can be worked around by using a mouse or updating Wacom drivers.
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We've seen bugs in third party plugins cause slowdowns - and the third party plugins will need updates. Unless you work with us to figure out why your particular system is running slow, there isn't much more we can do. Plus, Apple needs to hear from customers that this is a problem, because that makes it a higher priority for them to fix the OS bugs. I have the same symptoms as Mathew Streten (two comments back).
I followed Jeff Tranberry's advice to reset preferences without luck. The WhiteWindowWorkaround plugin also made no difference. I upgraded from Lion to Yosemite to get ready for LR6:-( My fallback is to restore from a CCC Lion clone. My symptoms are general sluggishness for example - moving through undo levels on a 16 megapixel 16 bit image takes 1.5 - 2 seconds each step, whereas it was previously instantaneous - option clicking a layer mask to show the layer mask contents takes 2-3 seconds before the mask is rendered LR5 is also noticably slower. My machine has an SSD with 12GB out of 16GB memory dedicated to Photoshop and scratch disk set to the SSD, and a Wacom Intuous 3.
• Adobe InDesign CS4. • Adobe Illustrator® CS4. • Adobe Device Central CS4. • Adobe Bridge CS4. • Adobe Version Cue CS4. Adobe Creative Suite 4 Design Standard.
Model Identifier: iMac12,2 Processor Name: Intel Core i7 Processor Speed: 3.4 GHz Number of Processors: 1 Total Number of Cores: 4 L2 Cache (per Core): 256 KB L3 Cache: 8 MB Memory: 16 GB Boot ROM Version: IM121.0047.B1F SMC Version (system): 1.72f2. Yeah i saw it was something with crashes happening because of video drivers, this is the problem im still having with photoshop and the other adobe programs. Its shown in this video: I dont know if the technical term for this is redraw but you can see how choppy and laggy it is when moving layers around or panning around the screen. This has happened now on a macbook pro 2.5 i5 intel hd 4000 16gb and a macbook pro 2.7 i7 16gb with intel iris pro.
Since not everybody seems to be having this issue, is there something im doing wrong with my system that could be causing this lag? Ive reinstalled osx multiple times, and with a fresh installation with nothing else on it besides photoshop this still happens. It is possible that a utility program, third party plugin, or a corrupt font could cause additional slowdowns. And if you have a bunch of layer comps, those can slow down layer moves (we've been investigating and are testing a fix for that). But most of what you showed appears to be just delays in drawing - which fits a couple of known driver/OS issues in MacOS 10.10. We've documented the known issues for Apple, and Apple has solved some of them, but we have to wait for Apple to solve the remaining OS issues in MacOS 10.10.
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