Product interaction and dynamic shop scripts
In particular, measure the choice of variants, gallery and shopping cart action. Assign delays to specific shop extensions instead of just looking at the first page structure.
Examine the specific slow action, such as changing variants or shopping cart. Shop plugins, product gallery and additional marketing tags can do work at the same time. HTML or page caching alone does not explain this bottleneck.
Where to check the setting in WooCommerce
Test a simple product alongside a variable product with gallery. Assign the slow interaction to a variant, gallery or additional plugin. Do not remove shop scripts in a blanket way: shopping cart, selection and price update must continue to work after the change.
Example of this specific finding
Illustrative control case: A click on the variant filter waits for a long JavaScript task before a visible reaction appears. The delay concerns a concrete interaction.
follow-up audit in WooCommerce
Repeat the measurement with a representative number of variants. After optimizations check product price, stock status and addition to the shopping cart; personal shop states do not cache publicly.
Repeat the problematic interaction in the performance trace, split up long tasks and reduce unnecessary work. Then measure the same interaction again.
Derogations and scope
INP is not a pure charging time code. A fast first side structure does not preclude slow later operation.
Regarding: WooCommerce on WordPress. Block and classic product templates as well as SEO extensions can have different output locations.
Classify the general error
Definition, system-independent causes and further correction examples: Name the slow interaction concretely