Timeline Y load page by page

Is there a way to load the timeline y incrementally while scrolling,
because we have a 10.000 rows timeline…?

You can turn on the smart rendering to show only the rows that are visible on the screen:

It will still take some time to create the timeline with so many rows, and it will hang for a while after moving or creating an event. But that option helps to improve performance.
Here is the snippet that demonstrates how it works:

However, you will encounter a bug if you turn off the section_autoheight option. The dev team will fix that bug in future versions.