Do you still have the old machine available? When I loaded my new machine I actually launched SONAR on both so that I could walk the dog on each page in preferences. With all of the tweaks done over time, a new installation will lose them which is why a side-by-side comparison is easiest to verify.
I did catch one LatencyMon post (I think it was yours), which showed Automatic Network Discovery being on. Type "Manage Advanced Sharing Settings" in the Windows Search, and you will see "Network Discovery" under each section (Private, Guest or Public). Be sure to check "Turn off network discovery," which is a ping the system does every 3-4 seconds. That particular "feature" is the #1 latency issue IME - if you are adding things to the computer, manual is safer than having Windows trying to connect to everything it sees every 4 seconds of its life.
This item is not an easy task, and more for reference. Definitely start with Task Manager as mentioned above, but keep the following in mind. On a new machine, "Services" often need to be scrutinized. Unless something is
required to run the machine, "Automatic" startup is not recommended. Most of these should show in the task manager; however, some are hidden and will only show up in Services (can type "Services" in the startup search). Right-clicking services that look odd and chaning startup type to "Manual" will force them to only launch when you launch them as a user. All of Adobe's services fall into this category, yet Adobe is also religious about resetting them to "Automatic" as well. All apps that have "automatic updates" or similar should be manual.