UCAC2 26891953

GPUMilliseconds the GPU takes to draw one frame. Shows n/a where the browser offers no GPU timing for web pages, such as Safari.

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Main threadMilliseconds the browser’s main thread spends preparing one frame: moving the camera, placing labels and sending draw commands to the GPU. At 60 frames per second, a whole frame has about 16.7 ms.

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Frame rateFrames drawn per second. The map draws only while something changes, so it shows Idle otherwise.

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TargetFrame rate the map aims for while something moves: 60, or 120 on displays that refresh at 100 Hz or faster, and 30 in power saving mode.

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Refresh rateHow often the display updates, measured from the browser’s animation frames. Shows – until measured.

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ResolutionSize of the image the map draws, in device pixels: its size on screen times the pixel ratio.

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Pixel ratioDevice pixels drawn per layout pixel: 1.5 on dense displays, and at most 1 in power saving mode.

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MSAAMultisample anti-aliasing, which smooths the edges of lines and shapes. It is set when the page loads, for displays below 1.5 device pixels per layout pixel; denser displays draw at a higher resolution instead.

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Power savingWhether power saving mode is on. It lowers the target frame rate, the resolution and the detail in nebulae and molecular clouds.

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Draw callsDraw commands the last frame sent to the GPU, across all passes. Each has a fixed cost, so fewer calls usually make a faster frame.

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PointsPoints drawn in the last frame, such as stars and their halos.

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LinesLine segments drawn in the last frame, such as the grid and orbits.

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TrianglesTriangles drawn in the last frame, the building blocks of shapes and surfaces.

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ProgramsCompiled shader programs: the GPU code that draws each kind of object. Counts here and below that keep growing while the view returns to the same content point to a leak.

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GeometriesShapes the map keeps on the GPU, each a set of vertices that objects draw.

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TexturesImages the map keeps on the GPU, such as the star dot and halo shapes and offscreen layers.

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Origin: Sun | Visibility from: Sirius A | Distance from viewer: —