@sdetweil I may have accidentally stumbled on what is causing the Pi to slog down.
Increasing the swap helped but definitely didn’t cure.
In process of troubleshooting a module by using Dev Tools Console, I noticed a different module, and IMO the module CONTENT is generating something called a Vuex Mutatation. I don’t have a clue what that is about other than it appears tied to the National Weather Service link I am using in MMM-SmartWebDesign.
I saw the line 304 on index.htmlso I pulled up MM’s index.html and it doesn’t even go that high.
I’ve heard of Chart.js and Moment.js but Vue.js is a new one for me. See attatched image. Any thoughts, suggestions…

Before I stumbled on to MM I messed around with Dakboard which is a subscription based Magic Mirror clone although I don’t know which one came first.
I just got a reply from Dakboard technical support for a question I asked in JULY 2020!!!
That will go in my store of memorable customer service horror stories.

@nyghtx You have the appropriate driver for screen installed on Pi? I know when I’ve bought screens that connect with ribbon cable I’ve had to install the correct driver to get it to work.

Is there a missing component in the MMM-NewsFeedTicker. I’ve installed it twice, one two different machines and it stopped MM in its tracks. Put in modules folder as required, copied config.js module block and put in config folder.
No settings changes, launched MM and got black screen. Pulled section of config.js back out, restarted, black screen.
Deleted MMM-NewsFeedTicker from modules folder. Everything back to normal.
Tried to launch dev tools but while window came up, there was an error message where normally would be css code, etc.

@sdetweil What is the deal with the periodic spam posted to multiple sections of forum? Saw that last night.

@sdetweil This is just broadcast to everyone right?

@harmzj that 32F threw me for several days before I made assumption that module was fine, it was somehow connected to data refresh (imo).
I generally try to stick to “official” sites like NWS/NOAA to avoid things like when Wunderground pulled plug on their data. I have NWS national radar coverage in MMM-SmartWebDisplay and on big TV project that image covers bottom half of US and display not crowded.
Similar deal with MMM-Jast using Yahoo data. Unlikely they pull plug on that data feed any time soon .

@sdetweil That was way easier than sorting out CSS.

@sdetweil Using your setup routine. Answer yes to both questions in your setup.
Primary culprit is when I’m using Developer Tools. Right now with nothing running but mm, MMM-SystemStatsshows about 30% free RAM.
When I would have VS Code, terminal, Developer Tools running it would get down around 5% free RAM.
Not sure how MMM-WeatherChart,MMM-SmartWebDisplayand MMM-Jastimpact things since WeatherChart is using Chart.js , Jast has the scrolling ticker and SystemStats has a pretty quick update rate.

This is a sort of generic question. I have a Pi 4B w/ 4GB ram attached to large screen TV
When I am actively changing things via config.js, custom.css, terminal open, the Pi really bogs down to point of locking up. I can generally twiddle my fingers for a while and it will come back and I can do some work which will bog it down again.

If I finish what I am doing, close open windows, reboot, reload MM it runs just fine,
I don’t see this on PC sized monitors at all.
Is this due to trying to drive big screen and edit scripts at same time and could I resolve by changing out Pi for 8GB model?