PostHog Script Performance
PostHog script benchmark: transfer size, decoded weight, and Slow 4G load overhead — recorded on AnalyticsVS fixtures so you can compare product-analytics cost.
Updated
PostHog Script Performance
Load time
Without analytics276 ms
With analytics1.56 s
+1.28 s
- Loading method
This script downloads in the background, so the browser can draw the page’s first visible content without pausing to load the tracking code.
- Script filesize
Transfer is the compressed download size, and decoded is what the browser parses afterward.
What this means for your site
On our empty test page, the load event finished +1.28 s later with the tag installed. On a real site, page load is likely to take at least that long — but usually not the full +1.28 s stacked on top of your other assets, because much of the work overlaps parallel downloads.
About PostHog
Open-source product analytics, feature flags, and session replay