The symptom

Product images arrive late. Buttons shift. Cart drawers hesitate. The page feels busy before the customer understands the product.

The cause

Theme code, third-party apps, pixels, fonts, media, and cache rules often grow separately. Nobody is looking at the total weight of the shopping experience.

The fix

Remove weak output, simplify templates, reduce script pressure, improve media delivery, and keep the platform if it can still serve the business cleanly.