How is this related to a stress test ?
You aren't stress testing anything besides your own hardware with mass signing transaction.
That's like saying: "I am going to stress test the post office by writing 100 words per minute".
If you do not send those mass letters (transactions), you aren't stress testing anything (besides yourself)
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If you really want to test something, you'll need to actually test the network. Not your own hardware.
Yeah i know that
let's say a 2cpu hardware processes 10tx/sec, then a 4cpu and 8cpu will process 15tx or 18tx per sec
getting better hardware doesn't always mean it would yield better results, even if it does then it would be fractional
2cpu and 4gb ram is a pretty standard amount of resources for a node