VerticalYearCalendar scrolling performance issue

[zeroarst]

Library information:

• Version: 2.5.4
• View or Compose module: VerticalYearCalendar

Describe the bug**

When using the VerticalYearCalendar, scrolling exhibits noticeable low frame rates (FPS).

To Reproduce (if applicable)

• Open Example11Page in the sample app.
• Scroll up and down through the calendar.
• Observe that the scrolling is not smooth.

Note: I tested this on a Samsung S23 Ultra, so hardware limitations should not be a factor.

Expected behavior (if applicable)

Smooth scrolling on VerticalYearCalendar.

Screenshots? (if applicable)

In the example list, scrolling is relatively smooth, but this is not the case with the VerticalYearCalendar. You can view the comparison here: https://imgur.com/a/pv8g4mN

Additional information

[a7asoft]

@zeroarst Have you been able to solve this issue? I'm experiencing the same thing but in view module.

[zeroarst]

@a7asoft
No, I just posted it today. I tried setting monthColumn to 2 and used a simple Text composable in dayContent without an additional Box wrapper. It seems to slightly improve performance, but I'm not completely certain.

[kizitonwose]

Will look into possible optimizations for the year calendar when I have some time (the API is experimental). But I imagine it would be quite tricky without resorting to just drawing the entire thing directly on the canvas. Keep in mind that there are 400+ times (Including in/out dates and headers/footers) to render in each year. Probably looks better with paged scrolling instead of continuous scrolling.