Express Generator is excellent for running multiple copies with the same or different settings.

The easiest way to do it is to write your commands in a "cmd" file and run it.

Here is an example of how to run ten copies of the generator on EURUSD M30

gen-eurusd-10x.cmd

start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period M30

If you want, you can have different settings in each instance like that:

start node .\bin\gen.js --symbol EURUSD --period M15
start node .\bin\gen.js --symbol EURUSD --period M30
start node .\bin\gen.js --symbol EURUSD --period H1
start node .\bin\gen.js --symbol GBPUSD --period M15
start node .\bin\gen.js --symbol GBPUSD --period M30
start node .\bin\gen.js --symbol GBPUSD --period H1
start node .\bin\gen.js --symbol USDJPY --period M15
start node .\bin\gen.js --symbol USDJPY --period M30
start node .\bin\gen.js --symbol USDJPY --period H1

Put the cmd script in the Express Generator folder and run it with a double click.
(You can run it from the terminal if want to debug it)

Please find the file attached.

@Popov
Thanks a lot, I didn't knew you could start it like this.
It seems to work, but I will do some further testing and try to compare with FSB pro.

@geektrader
Thank you. I also figured that it would be better to put it in a loop.
But instead of batch I did it with python since I'm more familiar with this language.

import os
for i in range(0,10):
  os.system("start node .\bin\gen.js --symbol EURUSD --period M30")

Is node the fastest runtime for this?
As suggested in an older post I tried out the enterprise version of GraalVM and also Bun via Ubuntu by using the Windows subsystem for Linux.
But with both of these I've gotten worse results than with node after 30min when using a single instance.