Photoshop CC 2015 is so slow it is unusable on my system

Yep, I've got this issue too with major delays and lag time with everything in Photoshop CC 2015's UI. Everything in the app takes so long to respond that I end up dragging layers and layer groups to the wrong spots, dragging items off-screen. All the menus and palette items are so slow to respond that I end up clicking on something in the background which screws everything up.

+1 horrible performance.

2015 has been a pretty poor release really.

Adobe should stop adding new features before important bugs and performance issues are fixed.

PS CC was great, CC 2014 was fine, and CC 2015 is unusable.

I was wondering if it was just me. I don't think it's a coincidence that my machine bogs down when I am using PS 2015. Photoshop is often very slow; jams up after a few hrs; binds up my entire machine. CC 2014 was not like this at all.

This is pretty frustrating, especially when I am trying to wrap things up at the end of the day.

im not sure if you're experiencing the same issue as me..

but my HOSTS file was too large/long..

which caused CPU throttling, and extreme lag.

Photoshop CC 2015 conflicts with large HOSTS file: CPU THROTTLING, LAG

I have been experiencing the same issues. Sluggish performance while panning and zooming, lots of intermittent spinning wheel, and the occasional lock-up to where I cannot switch between tools. Disabling the rulers and the Transformational Values as discussed in the following thread seemed to help for a few minutes but eventually the performance of the program slowed down to a crawl thereby making it unusable. I also increased the memory usage to 85% but to no avail. After rebooting for the 12th time in two days, I am going to downgrade back to 2014 until the issue is resolved.

https://forums.adobe.com/message/7681852

https://forums.adobe.com/message/7650088#7650088

Photoshop CC 2015 too slow

Same here. SLOOOOOOOOOW. Macbook Pro Retina Late 2012 with 8GB ram 650M graphics. spinning disk, lag, delay, saving is slow. 90GB free on SSD internal and its a pain to work on even low res files. 2014 didn't have any problems like this. And also the export as  replacing save for web is a piece of crap.

New isn't always the best...rulers shouldn't be a deal breaker in CC.

Also what's the point in having RAM if PS relies to much on R/W action, that seems backward to me.....I'm not upgrading for now as I need a system that is stable for professional work. I have commissions to finish.

Same here on PC and slow with 24 Cores, 96GB RAM on Nvidia Quardo 6000 with RAID 0 array for scratch disk.

Photoshop CC 2014 runs acceptably fast but Photoshop CC 2015 - Sloooooooooooooooooooowwwwwwwwwwwwwwwwwwwww.

I use the rulers so left them turned on just like I did in PS CC 2014.  Is disabling rulers a new feature in 2015 that's designed to kill the app?

Looking at resources, with plenty of free memory available, it appears PS CC 2015 doesn't seem to want to use memory but is instead sending a lot of R/W action to disk.

I am having the exact same problems, been running fine all day and now all of a sudden this, right in the middle of crazy deadlines.