Is there any way of eliminating some of those Chrome threads? I have 10.
What do you mean by threads? If you mean chrome.exe processes, there are a few base processes plus one for each tab you open. That's why it doesn't matter if you create a new window or not.

https://www.howtogeek.com/124218/why...pen-processes/
Basically, each tab has one process unless the tabs are from the same domain. The renderer has a process for itself. Each plug-in will have one and so will each extension that is active.