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Probably the single simplest thing you could do would be to replace the hard drive in either system with a Solid State Drive. They're relatively inexpensive now (you a decent 500GB drive for around $120 now) and make a huge difference.
There is inexpensive software you can buy to help you migrate data over to the new drive, or you can just do a fresh install of Windows onto the SSD (which I recommend). You can even buy a $10 enclosure that will let you use your old spinning drive as an external hard drive.
If you don't want to get involved in a physical upgrade, check to see what else your system is doing while you're playing OOTP. Anti-virus, background updates, search indexing, etc. It all adds up. You can use the Task Manager and Performance Monitor to help figure out what process (or processes) are the culprit - check for disk utilization, in particular.
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