A notebook that weighs more than a kilo is simply not a good thing
– Linus Torvalds
If you are an adult, able-bodied human male, and you even notice a laptop being "heavy" becauase it's over 1000 grams, I am sorry but your health is fucked. I am not a strong man. But if you are so weak 200grams extra or whatever bothers you, sort your life out. Seriously. You will feel so much better.
Depends how far you have to walk…
I travel with strict luggage limits (both size and weight) and hike all day. Removing weight absolutely helps.