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I would say a VPS is critical for EA-based trading.
Otherwise you have to ensure that your PC’s internet connection is really fast, with low latency to the broker’s server, that your PC is always running 24/7, and that the internet connection is very stable and never goes down. If your internet connection goes down your EA may not manage the trades properly and you may lose trades because of that.
You can find cheap VPS, like:
– Contabo
– Hetzner
– Hyonix
Make sure to select Windows OS.
MT5 can run on Linux using certain tools, but setting that up is not for beginners.
Out-of-sample profit means this is the profit result obtained by the EA with new price data, which the EA had never seen before.
The EA is optimized with “in-sample” price data, up to a certain date. Beyond the end of the in-sample period, we are dealing with “future” or live price action, which was not used to optimize the EA.
The out-of-sample performance is an indication (but not a guarantee) of potential future performance.