As it was sayed on the link below
https://themeforest.net/item/xstore-responsive-woocommerce-theme/15780546
the Xstore is faster 2X than an other one.
from google on desktop : slow
First Contentful Paint
0,8 s
Time to Interactive
5,9 s
Speed Index
5,0 s
Total Blocking Time
2 360 ms
Largest Contentful Paint
1,2 s
Cumulative Layout Shift
0,178
On mobile
STATISTIQUES
Expand view
First Contentful Paint
3,4 s
Time to Interactive
14,6 s
Speed Index
12,6 s
Total Blocking Time
3 180 ms
Largest Contentful Paint
11,1 s
Cumulative Layout Shift
0,306
How to have a fast template as you sayed
regards
Youssef