Resizing windows choppy

Has anyone figured out how to solve this issue? It's plagued my iTunes. I've stopped using iTunes completely now. If this persists, I guess I'll just cancel Apple Music and stick to Spotify. Total pain.

FWIW, reinstalling the OS will not change the behavior of the iTunes window. It is also not video card related. What is being referred to as "choppiness" seems to be related to how data is handled by iTunes when you drag its window and how fast one's connection is.

Hey,

Just wanted to add that it's the absolutely same here with my macbook pro 2016 13" regular. And it's not just iTunes, it's the same with iMovie for example. Also some random occuring spinning balls while browsing. A 2011 iMac running Sierra as well runs smoothly as I wish it would be.

Also, because you can't wake up a macbook pro 2016 while a non certificated usb-c adapter is plugged in without loosing your wlan signal (and i didn't know), I had my macbook replaced within the first 14 days. I tested two brand new machines, with a time machine backup and with a total new setup. It was choppy, every, time. I didn't lose my hope but **** I'm disappointed.

Hoping for High Sierra, but not too much.

I have the same isue with some programs in both Sierra and High Sierra (which was claimed to fix such kind of problems because of Metal use for Window). One of that is iTunes. Here is the video with isue iTunes resize low fps on Vimeo

Hello msecerov,
Thank you for using Apple Support Communities. It's my understanding since upgrading to Sierra, you've experienced issues with resizing app windows. I know it can be concerning anytime the expected performance changes. I am happy to help

First, I recommend testing this issue in Safe mode. This will allow your Mac to run certain checks, prevent startup items from automatically launching, and delete cache. Follow the steps below to start in safe mode.

1. Start or restart your Mac.
2. Immediately after you hear the startup sound, press and hold the Shift key.
3. Release the Shift key when you see the Apple logo appear on the screen.

After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.

To leave safe mode, restart your computer without pressing any keys during startup.

Try safe mode if your Mac doesn't finish starting up
If the issue isn't present in safe mode but returns when restarting normally, try disabling login items using the link below:
macOS Sierra: If you think you have incompatible login items
If this issue persists in safe mode, it's possible user settings or files are the cause. In this case try testing in another user account. Use the following link for assistance.
How to test an issue in another user account on your Mac

Cheers!

Thank you for trying the steps we suggested and following up. The additional information you've provided is very helpful. Next we recommend resetting the System Management Controller (SMC). This can resolve issues with slow performance and response. Follow the steps below to reset the SMC on your iMac.

1. Shut down the Mac.
2. Unplug the power cord.
3. Wait 15 seconds.
4. Plug the power cord back in.
5. Wait 5 seconds, then press the power button to turn on the Mac.

Reset the System Management Controller (SMC) on your Mac

If the issue continues, back up your content and reinstall macOS Sierra using the link below:
How to reinstall OS X

Just wanted to say that I just tried this and I have the same exact problem on a new 2016 top model MacBook Pro.

Resizing the window is embarrassingly unresponsive and choppy. Such a basic function.

I also get extremely low frame rates when expanding/collapsing an album in album view. Does anyone else get that also?

Just seems awful.

Read this article could help you : macOS Sierra: Manage windows on the desktop

Hi, I have a Macbook Pro 13 retina (mid 2014) and I tried everything to fix this.

I don't know is Apple trying to do, but from the Yosemite, to El Capitan and now to MacOs Sierra, this animations are ridiculous. It's something that really annoying me and many other users. Just a quick search in google and you find mountains of users complaining about this. A Windows 10 installed in bootcamp is snappier than the O.S. made for the hardware... Apple HAD strength with performance in their devices. Even my Iphone 7... &*(ˆ**&()()... I'm really sad...

Same issue, new top model 2016 MacBook Pro with the upgraded graphics driver and hard drive and iTunes is buggy as ****. Constant beachballs, resizing is choppy, songs can stream/play but I can't download tracks permanently (they start to download and then immediately stop). This is still happening after updating to macOS Sierra 10.12.2 and iTunes 12.5.4.42 today.

iTunes also starts up with my playlist column missing on the left every time. It reappears if I switch to another type of media in the chooser - e.g., "Movies" or "TV Shows" - and then go back to "Music".

WHAT. THE. ****.

The solution is to reinstall the OS? Wow... Has anyone tried this and has it worked?

It just seems video card driver related and I'd expect a simple fix, not nuke and rebuild.

top model 2016 MBP 15" too and even with radeon card active some windows resizing is choppy: very disappointing (os Sierra 10.12.3): never seen something like this in the past.

Bravo Apple!