Performance Snapshot

Capture local browser timing, request counts, transfer size, largest resources, and third-party domains for the current page.

Performance Snapshot gives developers, agencies, and site owners a fast local timing report for the active tab. Open the popup to capture Navigation Timing and Resource Timing from the current page. The report highlights DOM ready, load event, TTFB, known transfer size, requests by type, largest resources, and third-party domains. Copy a plain-text summary or export JSON/CSV for handoff notes. This extension does not replace Lighthouse, PageSpeed Insights, or lab/field Core Web Vitals tools. It reports local browser timing entries visible to Chrome at capture time. Some transfer size values may be hidden by cache state or cross-origin timing restrictions. Free features: - Current-page snapshot. - Copy summary. - Export JSON. - Export CSV. Supporter roadmap: - Saved local history. - Before and after comparison. - Branded client report. - Batch URL checklist later.