When I did comps, the lightest I ever had my bike was 9.8kg I think.
I go for reliability over weight saving, I don't like having things flex and take away from the precision, I like to have grippy tyres that have the most grip and decent puncture protection as there is no point having a light bike and then not being able to do anything due to the tyres not gripping, bouncing you off rocks and getting punctures.
Right now my street bike weighs around 11kg and that seems plenty light enough.