— Overall performance is average.

— Sloppy vertical scrolling.
— The third graph zooming is broken. It happens right after you tap the point on the graph.
— Dates are overlapped when scrolling.
— The last graph is slightly slow when filtering on Samsung Galaxy J7 (2017), Android 8.1.
— Bonus goal is implemented. However, the animations are slightly harsh.
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Upd.: All the graphs are empty on Android in some cases, (the attached video #1), vertical scrolling is not smooth (the attached video #2) on Galaxy J7.

Chart 2Y: preview not starts from min value

Line 1Y: no smooth animation when toggle data filters

Stacked: wrong date for last right bar

Sometimes zoom stops to work with NaN everywhere.

All the graphs blink on vertical scrolling.

The graph #4 disappears after filtering the zoomed version.

Not working in IE11
Invalid state after many zoomin/zoomout in pie chart (Chrome)

but I like transition animations. voted

- no smooth animation between values
- parts of long numbers separates by ",", but not by " "
- strange values on the y axis
- text animation works not every time

Stacked: red values not visible

Bars: when zooms - no preview for chart

Line 1Y: date render outside of chart

Bars: wrong date for last right bar

Percentage: wrong date for last right bar

Stacked: preview not scaled to max Y value

All controls get turned off after long tap, but charts not completely updated

As you asked. Long tap for control buttons doesn’t work on iPhone se, it just turns off all controls

Wrong local range Y

2 bugs:
1) If you tap an graph in the place where the tooltip appears - a zoom will occur immediately
2) After the zoom from point 1 - you cannot zoomout

Last chart has NaN values for first day. Try to select first day at chart and you will get empty result how on screen

Performance isnt so good but animation is really awesome. Like it

Wrong percentage and values displayed in the pie chart if you compare them to the related date's values and percentage.

The pie chart is completely broken for the couple dates at the beginning and at the end of the chart. That breaks the usage of the chart until page reload.

Wrong design of switched off buttons

The dates format is not as required by the contest specifications

No pie chart sector separation on hover / touch / click

Anyways, I think it's unfair for such a work to have so many dislikes. All bonus tasks have been implemented and the design guidelines are mostly followed.