Free boiling timer for pasta vegetables and rapid cooking. Track boiling time from first bubble. Fast cooking with precise timing.
Full rolling boil is when I see big vigorous bubbles continuously breaking the surface that don't stop when I stir the pot. Small bubbles around the edges or occasional bubbles in the middle aren't enough - I need aggressive action throughout the pot. Temperature is 212°F at sea level lower at higher altitudes. I learned to wait for full boil before adding pasta or vegetables because adding food to not-quite-boiling water increases cook time unpredictably. The visual difference between simmer and full boil is super obvious once you know what to look for. Full boil means I can't stop the bubbling by stirring.
I add salt before boiling now because it doesn't significantly affect boiling time despite old myths. Salting pasta water properly like the sea means about 1-2 tablespoons per gallon makes such a huge difference in flavor. The salt seasons food as it cooks from the inside out which you can't replicate by adding salt after. Some people say salted water boils slower but the difference is maybe 30 seconds which doesn't matter. Salting after boiling works but I'd have to add salt directly to food instead of benefiting from seasoned cooking water. I just dump salt in cold water and move on.
I use 4-6 quarts of water per pound of pasta - more water than I think I need. Lots of water prevents pasta from sticking together by diluting starch that gets released during cooking. Too little water means concentrated starch making everything gummy and clumpy. My pasta also has room to move around freely rather than clumping in a small pot. The water temperature drops when I add pasta so more water means it returns to boiling faster. I use my largest pot for pasta even if it seems excessive. Some people use less water successfully but I've had too many sticky pasta disasters to risk it.
Starchy water from pasta rice or potatoes foams up and boils over easily especially if pot is too full or heat is too high. I never fill more than 2/3 full to leave headroom for expansion and foaming. Once at a boil I can often reduce heat slightly while maintaining the boil which reduces boiling-over risk. A wooden spoon laid across the top breaks bubbles preventing overflow which sounds weird but actually works. If it's actively boiling over I immediately reduce heat or remove pot from burner for 30 seconds. Fat like oil or butter added to water reduces foaming but some people say it prevents sauce from sticking to pasta later.
Yes covering the pot traps heat making water boil significantly faster - maybe 30% faster in my experience. But I remove the lid once at a full boil especially for pasta or it'll boil over within seconds. For bringing water to boil covering is a total no-brainer that saves time and energy. Some people leave lid slightly ajar while boiling to prevent boil-overs but I just remove it completely. For long boiling like making stock I might cover partially to prevent excessive evaporation while still allowing steam to escape. The lid decision affects timing but more importantly prevents kitchen disasters.