Depends if 11kg is considered too heavy for you to pick up and carry around.
When riding a bike, weight doesn't matter much.
You won't feel +/- a few kilos when riding, but when carrying, that's a different story.
You can probably drop 5 kilos off it but it will cost you 2000 quid.

I found the cost/weight value decent when swapping the seatpost, handlebars, grips, pedals, saddle, and levers.
You might want to start researching how much those parts weigh and cost to swap on your bike.
There are no hills in Bangkok so I went single speed and lost a few hundred grams for free.