Performance issue

Can you please specify what exactly you feel doesn't perform well (initial loading, scrolling, updates...)?

I also recommend reviewing the following document - it lists some basic hints related to performance:
https://doc.daypilot.org/scheduler/most-common-mistakes-that-hurt-performance/

Hello,

The issue that we have is that the progressiveRowRendering is not working, it loads all the cells for our ressources (200+) at once, even if we set the progressiveRowRendering = true.

We tried different heightSpec : Fixed, Max, auto, nothing is changing, still not getting the progressiveRowRendering.

Here you can see all our props: https://rogerrh.sharepoint.com/:i:/s/Product/EY0kRsBybf9OpaBUmDZEXZEBRfC5ifWdHJFzk0TisWBoXQ?e=x58QMM

Here is a little gif, showing that everything is preloaded: White & grey cell backgrounds, what I expect it to do is to flicker for a short moment before rendering the cells:
https://rogerrh.sharepoint.com/:i:/s/Product/EUVVrgkzWV9CqVadna38_TABBKLUyvYBUhs0RgEER1TW8Q?e=90rr48

The progressive event rendering is working, you can see that the events take a small moment to render.

Also another proof of the issue is that when we are in a month view, opening a modal is slow about 0.5 - 1 sec, while in week view it's instant, which is normal, about 4 times less cells to render

Thanks for the update.

To detect that a row has been rendered, you can use onBeforeRowHeaderRender event:
https://api.daypilot.org/daypilot-scheduler-onbeforerowheaderrender/

You can also increase the debouncing delays to visualize the rendering of rows and cells:
https://api.daypilot.org/daypilot-scheduler-scrolldelaycells/
https://api.daypilot.org/daypilot-scheduler-scrolldelayrows/

By default, both these properties use a value of 0, which means the cells and row headers are rendered synchronously. If the content is heavy, this may affect performance.

1. Try using very high values (e.g. 1000) temporarily to see which cells are rendered in advance.
2. In the next phase, try lower values (according to https://doc.daypilot.org/scheduler/scrolling-performance/) and see what works best for your scenario.
3. Try turning off the row header width auto-fit (https://doc.daypilot.org/scheduler/row-header-width-auto-fit/). This is a convenient but very expensive feature.

I assume that the modal dialog (onEventClick) delay is related to this question:
https://forums.daypilot.org/question/5830/onbeforecellrender-loading-after-trigger-click

I recommend following the advice from that question to prevent the Scheduler component update.