When I review the logs I see repeated log entries for the same item separated by a small fraction of second for the same action. Is that expected or is this an indication of a problem I must solve?
What type of devices are these? Make and Model? Zigbee, Z-Wave, or Wi-Fi?
Outside Landscape lights is a GE/Jasco z-wave switch
Dining Art is a GE/Jasco z-wave Plug
Living room North light is GE/Jasco z-wave plug
Are you running the Z-Wave Poller by any chance? If yes, try disabling it to see if things calm down.
The only thing I have is a range extender from Aeotec. To me the log are quite noisy which also could the cause of the appearance the hub is not as fast as hoped. In my mesh I actually have 80 devices most are z-wave, One or two Zigbee and eight Hue lights which are first generation,
I recommend you reach out to Hubitat support@hubitat.com. Probably best to have them take a look.
I grew weary of my old GE/Jasco Z-Wave (not plus) switches and dimmers not reporting physical status updates correctly. So, I replaced everything in my house with Lutron Caseta switches, dimmers, fan controllers, and Pico remotes. I have had zero issues with Lutron. Not a cheap solution, for sure, but it is a reliable one. 
Hopefully Hubitat Support can help provide some troubleshooting advice.
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I replaced my last GE z-wave (non-plus) switches today. Oddly, my z-wave network seems more responsive now.
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Most devices have a setting to change whether logs are recorded or not.
If you don't need them for debugging, simply turn them off.
