Produce a structured debugging report that identifies root causes, provides actionable fixes, and prioritizes by severity. Write in a {{tone}} tone. Target {{browsers}}. Performance goal: load time under 2 seconds and 60fps rendering. If a fix cannot be determined with high confidence, skip that section. Output word limit: 400 words. Output format: ISSUE #[n], TYPE, SEVERITY, REPRODUCTION steps, and SOLUTION. Paste any relevant background information after these instructions before running.