The Shelter System
Your shelter is one of 'The Three Heavies' in your pack and so getting the right shelter system for your trip can make a very big difference to the weight that you carry. The most common shelter people use in the outdoors is a double skin tent which generally has an inner and outer layer, metal poles and a thick groundsheet.
If you have been used to a large comfortable tent (3kg+), we are not going to suggest an immediate drastic change to a micro tarp. It would be too much of a comfort shock. However let's look at the system you use and ask some questions.
For a solo hiker there are now 2 skin tents available weighing between 1kg and 1.5kg. However anything sub 2kg is ideal. With your tent do you normally take a pile of extra pegs (just in case), a ground sheet protector, all of the guy lines and the original bag it was supplied in? Why not weigh those separate items and see what they add up to (1kg+)? Then consider exchanging them for lighter alternatives, such as Titanium Pegs, Dyneema Cord, Mini Line Locks and an Ultralite Bag. Do you really also need that ground sheet protector?
If you go to the next stage and consider a tarp supported by walking poles, a whole new world opens up to you at minimum weight. All of a sudden you can have a large shelter system for under a kilo. (Without a groundsheet or bug netting). In fact the 2010 Shangri-La 3 tent will provide you with an enclosed space for 3 people at only 800g (excluding groundsheet). Doesn’t that old tent suddenly start to sound heavy by comparison? (Saving 3kg+).
Can you give me some ideas?