Need help choosing the light weight template

I am having trouble with managing site speed with my existing wordpress theme, and I am looking forward to change the theme which loads faster and passes most of the google pagespeed insights rules. I tested some themes in themeforest but they are not impressive in terms of loading speed. I wonder if someone can suggest me the theme that fits with the layout of my website (lescobill) and loads faster.

Thank you in advance.