Viewerframe Mode Refresh Work ((free)) -

The "work" phase cannot complete consistently within the refresh budget. Often due to CPU spikes, inefficient GPU operations, or a mode mismatch (e.g., real-time mode on a variable-frame-rate source).

Speculative Rasterization. The GPU renders three possible future states (Object Left, Object Center, Object Right). When the actual data arrives, the viewer discards the two incorrect frames and displays the correct one instantly. viewerframe mode refresh work

The browser is then told to "refresh" that image at a specific interval (e.g., every 30 seconds). The "work" phase cannot complete consistently within the

If the user rapidly clicks “next frame” while a refresh is already queued (e.g., from a mode switch), the frame counter increments twice but only one visual update occurs. Medium inefficient GPU operations

This is the heavy lifting: