My wife has a late 2013 21.5" iMac with 2.7 GHz Core i5, 8GB memory, Intel Iris Pro 1536 MB graphics, and a 1 GB 5400 RPM hard drive (25% used). It's gotten slower and slower over the years, but has always been sluggish. I remember being disappointed when we bought it. I was about to buy a new one for her and then I thought about just replacing that horrible hard drive with an SSD. I don't want to attempt it myself, but a local Mac shop will put in a 512 GB Crucial SSD, install a new OS and migrate the old data over for about $380. Am I right in thinking that swapping out the drive can have a big impact on her experience? She only really uses Safari, Photos and Spotify for the most part. Nothing heavy duty. But she continually gets the beachball and very often has really slow response time. (And yes, I've tried all sorts of performance tuning procedures to try and get it to work better.) I'd like to know if others think that the old, slow hard drive can have such an impact on performance and if replacing it with an SSD could be the trick. I'd certainly rather pay under $400 than buy a new iMac plus tax and AppleCare. Thanks!