Here is what I do when running VMs. I think at least some of these would apply.
1. From Control Panel\System, Go to Advanced system settings\Advanced\Performance\Settings\Visual Effects - Adjust for best performance.
2. While you are there, go to the System Protection tab and turn off System Restore.
3. Services.msc. Pull up the following services, Click on Stop, and change to Disabled:
a. Windows Search
b. Wireless Zero Configuration (only if you aren't running wireless of course)
4. Go to Programs and Features in the Control Panel, Select Turn Windows Features on or off, Uncheck Windows Gadget Platform and the Indexing Service (if it is checked).
5. Pull up msconfig, go to the startup tab, and uncheck anything you don't need. Up to you if you want to remove the registry entries instead.
6. Use a light AV like MSE. It will automatically stop the default Windows Defender service. In using another AV, you may want to check and make sure Windows Defender is not running, as you don't need both.
You would do very well to upgrade the RAM, if it is feasible to do so.