1. run the attached example
2. scroll down to the last row
3. click "Populate Data"
it takes 9s to complete the rendering
should take shorter
- if I don't do the step 2, the rendering time is very short
this.create_() creates 1919 rows and 20 columns which is much larger than expected. it created all the missing rows from initial-rendered row to the last row. It should render 80 rows (preload row size is 80) from the last row.