low resource software to moniter internet use ?

I use Glasswire. It has bandwidth monitor as well as firewall. You can easily see which program uses how much data and when. You can also block programs from connecting to internet. And it barely uses any ram.
 
I used to use du meter ages ago, literally in the days of dial up. last many years using bwmeter. works awesome. not sure about resource use though...
 
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