justynabukiel commented on issue #12023: Lags when using timeline with many (> 100) items with SVG rendering URL: https://github.com/apache/incubator-echarts/issues/12023#issuecomment-573671555 First of all, thanks for answering my ticket. I have data (to be specific: user's statistics) from several years grouped by different time ranges: by years, months and weeks. Each time I change grouping parameter, I redraw the chart. For years and months it works well, because there are not so many items on the timeline. Here's an exmaple of grouping by years.  But when I switch into grouping by weeks, I have 52 * numbers_of_years items. And this case causes performance issue. On the timeline below the "empty" weeks have symbol with opacity = 0, only those with any data are visible. But, as I've mentioned previously, all items are rendered in DOM, even if they are not visible. 
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