negligible – the more common bottleneck occurs when attempting to render lots of graphical elements at a time (e.g., a scatterplot with a million points). In those scenarios, you likely want to render your plot in Canvas rather than SVG (the default) via <code>toWebGL()</code> – for more information on improving performance, see Chapter <a href="performance.html#performance">24</a>.</p>
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<p>In many scenarios, it can be useful to combine multiple graphical layers into a single plot. In this case,