Welcome to HE and to the online community! That does seem a tad strange for a new, out-of-the-box hub, but there are a couple of things you can check.
If you go to the logs page and then look at device stats and app stats it will tell you what is consuming CPU, if anything. Does anything pop out? (If you actually have no apps installed yet you can focus on devices.)
Are your Jabsco devices zwave or zigbee? If zwave there are some additional things we can take a look at but try the following first.
You can also insall a cool driver by @thebearmay called Hub Information Driver that reports various hub performance stats so you can see it in real time... here's a link if you want to give that a try. (Hint: loading Hubitat Package Manager first will help both with Hub Information Driver and most any other custom app you care to install.)
