MediaSimple mode
Videos
Checks videos for poster images, preload strategy, autoplay behavior, and support for efficient formats such as WebM.
Why it matters
Video is one of the easiest ways to accidentally overload a page. Poor preload behavior, missing posters, or heavy media files can delay visible content and waste bandwidth before the user interacts.
Where to run it
Available automatically in Simple mode.
Can also be explored in more depth from the underlying WebPerf Snippets reference.
Open analyzerWhat you learn from this test
Whether videos are loading too aggressively
Whether the user sees a visual placeholder before playback
Whether modern and lighter delivery options are being used
Common fixes
Add poster images for above-the-fold videos
Avoid eager preload when the video is not critical
Use efficient formats and delivery settings
Review autoplay behavior to avoid browser blocking and wasted bytes