TL;DR please be nice with yourself: only drop pasta in a pot of boiling water (approx 1 liter every 100 grams of pasta)
To the eyes of an Italian, the mere allusion to cooking pasta by dropping it into a pot of cold water is unthinkable.
You always need to drop pasta into a pot of boiling water in order to cook it. On the contrary, you'll end up eating a dish of overcooked pasta with an unpleasant gummy consistence.
The rule of thumb is approx 1 liter of water for 100 grams of pasta.
Another rule of thumb is opting for the best brands, the ones whose plants are settled in the southermost regions of Italy (Campania, Basilicata, Calabria, Puglia, Sicilia, Molise etc.).