Low speed Chart

[m2faridi]

Your chart performs extremely poorly on 500 candlesticks
please see this video

https://vimeo.com/user108517719/review/509174535/faff05e7f8

My phone is Samsung S10 plus

[m2faridi]

this code for sync all charts

double zoomPosation=0;
  double zoomFactor=0.15;
  void chartZoomSync(ZoomPanArgs zoomingArgs ,int index){
    if (zoomingArgs.axis.name != null && int.parse(zoomingArgs.axis.name) == index) {
      if(zoomingArgs.currentZoomPosition!=zoomPosation || zoomingArgs.currentZoomPosition!=zoomingArgs.currentZoomFactor)
      {
        zoomPosation = zoomingArgs.currentZoomPosition;
        zoomFactor = zoomingArgs.currentZoomFactor;
        setState(() {

        });
      }
    }
  }

onZooming: (zoomingArgs) { chartZoomSync(zoomingArgs,index); }

[m2faridi]

I would love to use your library in the program I am working on, but unfortunately the speed of your library is not good at the moment.
I am currently using the mpFlutterChart Library
Please fix speed issues. Thank you
link app

https://play.google.com/store/apps/details?id=com.m3.Trendo

[Dharanipalani]

Hi @m2faridi,

Thanks for the interest in our Flutter charts. We have analyzed your scenario and the problem is due to calling the setState in onZooming event in the sample level. We have handled this in the source level, the onZooming event will fires automatically while zooming and the assigned zoomFactor and zoomPosition values will be updated, so no need to call the setState to update them. We have attached the sample and screen record for your reference please make use of it.

Sample: https://www.syncfusion.com/downloads/support/directtrac/314111/ze/I314111-candle_performance1745787120

screenshot for updating zoomFactor and zoomPosition values,

Screen record: https://www.syncfusion.com/downloads/support/directtrac/314111/ze/I314111-candle_record-1063564876

Please revert us if you need any further assistance.

Thanks,
Dharanitharan. P

[m2faridi]

Screen record: https://www.syncfusion.com/downloads/support/directtrac/314111/ze/I314111-candle_record-1063564876

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[m2faridi]

Performance is still very poor

[Dharanipalani]

Hi @m2faridi,

We regret the inconvenience that caused. Now, we attached the sample and screen record below please make use of it and revert us if you have further concerns.

Sample: I314111-candle_performance.zip

Screen-record: I314111-candle_record.zip

Thanks,
Dharanitharan. P

[m2faridi]

I replaced your codes
But it was not high speed
For example, run the same code with 5000 candlesticks and it will slow down

[m2faridi]

Please check the speed of this chart
https://github.com/SunPointed/MPFlutterChart

[Dharanipalani]

Hi @m2faridi,

When we use more points, the performance lag occurs while zooming. However, we are trying to improve the performance for the candle type series which will be included for volume 1 main release which is expected to be rolled out at the end of March 2021. We appreciate your patience till then.

Regards,
Dharanitharan. P

[Dharanipalani]

Hi @m2faridi,

Thanks for being patience. We are glad to inform you that the reported performance issue in the candle series is fixed and here we shared the performance metrics for your reference. We are continuously working on performance improvement and it will be in our upcoming releases.

Performance metrics:

Before Improvement	After improvement
Candle	Candle
1.5k - initial zoom - 3000 ms (3s) further zoom - 1500ms (1.5s)	1.5k - initial zoom - 800ms (0.8s) further zoom - 100ms (0.1s)
5k - initial zoom - 15000 ms(15s) - further zoom - 10000 ms (10s)	5k - initial zoom - 8000 ms (8s) further zoom - 2000 ms (2s)
Spline	Spline
1.5k - initial zoom - 130ms further zoom - 70ms	1.5k - initial zoom - 70ms further zoom - 20ms
5k - initial zoom - 400ms further zoom - 200ms	5k - initial zoom - 210ms further zoom - 60ms

To resolve the performance issue, you can upgrade our charts from the below link.
https://pub.dev/packages/syncfusion_flutter_charts/versions/19.1.54+1

Thanks,
Dharanitharan. P

[m2faridi]

Improved, but we still have lag. Optimize when zooming and moving