Depending on what your doing you really shouldn't be having issues with those specs. I've seen Windows 10 run smooth on old i3 processors with 4GB of ram that originally came with Windows XP once a SSD drive was put in. Obviously it's not going to handle anything intensive like photo editing or video encoding but no issues with web browsing and Netflix streaming. A SSD drive upgrade can make a big difference if the machines have spinning drives in them.
You can try some of these tools to see if you can gain any info.
https://www.makeuseof.com/tag/13-windows-diagnostics-tools-check-pcs-health/
I would do a clean Windows install on one of the machines. Then make sure all Windows updates were installed, check the manufactures site for driver updates. Not adding any files or programs for a few days to see how it runs.
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