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Message: <blockquote data-quote="bbnck" data-source="post: 1735986" data-attributes="member: 384434">Definitely not feeling adventurous with replacing the hard drive with an SSD on this iMac. Requires complete disassembly - I'll no doubt end up breaking something which is a risk I don't want to take.Perhaps, and I do certainly notice the difference in launch times and so on, but I do notice system performance on my iMac to be much faster than my Windows computer with an AMD Athlon X4 860K processor. Here's what is interesting though: if I lower the resolution on the display (e.g. to 2048 x 1152 or 1600 x 900) when I am running lots of apps, the animation lag goes away completely. This suggests to me it's either caused by a shortage of memory, the GPU being inefficient to handle the HiDPI resolution or Apple not optimising their software well. If it's the GPU, I dread to think what the iMac 4K is like with its integrated GPU.I realise an SSD makes a huge difference to overall system performance, but any computer with a mechanical drive should still perform acceptably. It's boot times, app launches and other I/O tasks that are noticeably faster, and can certainly give the impression that a computer is more powerful than it really is.I'll update this thread once I've upgraded the memory to 16 GB to see if that helps. I'm hoping it does.Thanks.</blockquote>