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This article records a performance optimization of the WebView based Flutter data visualization library: echarts_flutter. The test case has three charts, including a WebGL 3D chart and a liquid animation chart: Flutter Dev Tool, we can get the flame chart of CPU time occupation:. The time of HTML loading while loading scripts grew on the time of injection, which contains the injection of scripts on the. page. The result is that the time is reduced, while the. time of. HTML loading on the page is reduced.