The weight of a tarp (or anything else) depends on what it's made of. The porch tarp I linked weighs 6.5kg because it's done in something like 15oz cotton. In say, 4oz PU Polyester, it would be substantially lighter and likely cheaper too.
If you're mainly interested in keeping the rain off so you can have the door open in wet weather (ever a problem with the sloping tipi/lavvu doors) a rectangular or square tarp, rigged A-frame fashion is probably your best bet. Bear in mind you are not restricted to setting your porrch/tarp to the peak of your tent. I use a square tarp with my Vango Peace 500 and have a couple of D-rings sewn to each other in- and out-side the canopy directly over the top of the door zip. I have a lashing from the inner ring to the pole and the tarp ridge line to the outer ring, so the ridge line is effectively secured to the pole. You may need to beef-up you pole as it gets some extra strain in windy weather.
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