Turveyd Yes it is possible that your 10 year old computer could process few indices at once on Mt4.
However the only thing we use MT4, for is trade execution. Our Algo's run in different environments and processes a basket of instrument per tick against each timeframe, it does this to decipher trends in real time as they develop. We are currently using 5 Gig processors and this is still not enough for our operations.
While many think that ML/AI is all bull ask yourself this question, doesn't it seem that your Gmail, Google or Bing search engine is getting smarter and more accurate with word prediction? Why is that? I can assure you that its not because they are using 10 year old processors and think ML/AI is fake.
More processing power and better code to take advantage off, not ML or AI!!