XPS 8930, new machine problems

I've been using a nine year old Windows 7 Pro machine with added hd and memory. It's been working fine, but I decided to get a new XPS 8930.

When I ordered it, est delivery time was five days. I called five days later and they had not idea when it would even ship. Rep awkwardly said "due to a delay from the manufacturer". I finally got it a few days later.

I thought since it has a graphics card rather than integrated on motherboard, there would be no problem. At least there would be better performance.

This machine seemed very fast for a few days. Now it's slow as molasses and graphics are extremely slow to catch up sometimes. I cleared browser cache, cookies, etc. Ran Windows Malicious Software Removal Tool, and checked the resident Windows Security.

I thought One Drive was causing it so unlinked and closed it. That may have been part of it.

Seems like a lot of ad related things show up at lower left of screen - handshaking with akamai, waiting for atwola, ads for this ads for that. But they aren't always present when the machine stagnates.

I never really had problems like this on any previous machine, including my last one, and others going back to Windows 3.1.

Any suggestions?