I believe so, more seasoned members of the Community can chime in, but I believe that is the case, removing dashboards and/or devices from dashboards can help in reducing the overhead of keeping tabs on their status.
Interesting question. I have 27 dashboards on my "Apps Hub" C-5 (mostly test, or temporary dashes that need to be deleted after helping folks). I don't notice any slow downs and it runs circles around my "ZigBee Hub" C-4, which is getting slower by the update it seems.
On my App Stats, Dashboards are running at 0.9%. While my Orbit Bhyve app is at 63.5% 
I think they only use resources when open. Like if you leave the dashboard open on a tablet or something since it needs to update the tiles as devices activate.
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It seems you are right. I did some test: I reset my app stat and watch for 2 days. Only the open dashboards showed activities. The unused one stayed at 0. Still the general dashboard app is my number one used. (48% of total used app but only 0.1% of total time)
I guess it's not that bad.
Just something to be mindful of. I try to limit the number of devices on any one dashboard to reduce the impact if I leave one of them open.
Have been tweaking the setup of the dashboard displayed on my tablet mounted on the side of my fridge. I recently setup Tasker and AutoRemote to allow me to have the dashboard displayed when I walk up to the the tablet (Motion Sensor and Tasker to Turn on Tablet (No Internet Required)), I have now added an extra step to my rule to refresh my live Solar usage stats to provide up-to-date details, using @funzie 's Solar Edge Driver. I still need to work on some of the aesthetics, UI's are not my strong point.... (Solar stats are at the bottom right of the screenshot).
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I know this is an old post, but I wanted to thank you for turning me on to HA & Lovelace. A few weeks ago I got it spun up and tied in to Hubitat, but this past weekend I was really able to dig in.
I've landed on the concept of having all my integrations/automation logic in Hubitat, and all of the UI/dashboard/front-end'y type stuff in Lovelace. I'm still tweaking things as I learn what you can & can't do with Lovelace cards & layouts, but functionally I'm 100% and I really dig it.
Thanks again.
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Not sure if this applies to you or not, but:
I was chasing "high dashboard CPU% usage" recently, as well. The way I solved it was to only expose the necessary devices to each dashboard. Previous to this, I would always just tick "all devices" so I had freedom to pick any device later and because I was too lazy to scroll through a big list of devices and only pick the ones I needed.
It appears the negative to the "all devices" approach was that the dashboard backend then had to sift through all device activity on the system and discard the stuff that doesn't matter; makes sense that on larger systems that this would be computationally expensive, relatively speaking.
Curious if you might have a lot of devices that aren't necessary for the dashboard you could peel off? I suspect that would have a positive impact as it did for me, if so.
You're welcome! Lovelace definitely has some awesome options.
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I have a couple of "magic mirror" in my house. I made a little dashboard which I linked to them in order to give me some reminder about unread text message or voicemail or movement alert. It is not really a dashboard per say since it is not interactive but it show me a big colored dot in the mirror when such an event happen.
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So jealous.... That looks amazing...
Researched DAKboard and magic mirror this morning. I'm looking to do the same. Yours looks great!
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Much like the last dashboard, I don't have much need for controls so I went the magicmirror route as well.
Picked up a open-box Samsung "The Frame" TV for a song and converted it into a picture frame with some at-a-glance info.
As for how it ties into Hubitat/Node-Red... Motion sensor in the top right corner of the room shows/hides the modules (short duration) when in the room and toggles power completely (30 minutes of inactivity) to save energy. I guess I could add some Grafana stats if I really needed to in an iFrame, but I'm not sure I want to clutter up the interface that much since it's primarily a picture frame for Google Photo albums.
Bonus, I can watch TV in there if I really wanted to. 
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Christ! A grand! Looks ace though.
Where did you get it or how did you make it
I made it. You need a raspberry pi, a screen, a see through mirror and this software:
I inserted the hubitat dashboard with the help of the "iFrame" module
I did get it open box, but yeah... the wife wasn't super happy at the time. But that space needed something and she's actually come around!
Anyone know if these has a compatible OS in
Pretty sure this is just a touch capable monitor so there's no OS to speak of. You'd need to provide a separate computer/SBC to run software. It's got HDMI in and the touchscreen is USB so it shouldn't be too hard otherwise.
