Very heavy HTML
Effort to fix: Moderate (a few hours)
Why it matters
Large HTML documents delay first render, especially on mobile connections, before any images or scripts even start.
How to fix it
Remove inlined data blobs, huge inline SVGs and duplicated markup. Paginate or lazy-load long lists.
On WordPress
Page builders and 'inline critical CSS' settings often bloat HTML; review builder output and optimisation plugin settings.