The BigData grid example currently starts with a conservative 1,000 rows.
Given the recent performance optimizations in the grid architecture, we should showcase the framework's capability by defaulting to a much larger dataset.
Proposed Change:

• Increase default amountRows to 20,000 in MainStore and ControlsContainer.
• Ensure amountColumns defaults to 50 (already set, just verify).
  The ComboBox store already includes options up to 100k, so no changes are needed there.