I've got a good laptop (Dell Precision M4800) that runs Windows 10 (and Ubuntu dual booted), and it's around 5 years old. It has 16GB of DDR3 RAM, an nVidia Quadro, Intel Integrated Graphics, and a 1 TB HDD. I generally keep it half full though, so its performance had been holding up for many years.
Unfortunately, the boot time and general loading times for all programs in Windows has slowed down to excruciatingly slow levels. I ran a memtest on my RAM and it still works perfectly. I adjusted my paging file sizes to increase speed. I think my hard drive is the culprit. Before I buy a 1TB SSD and clone over my hard drive, are there any other issues I should watch out for that may make upgrading my HDD unnecessary? Here are the results of testing my HDD with Crystal Disk Mark 6: