This repository reproduces a significant memory usage issue in Symfony Forms when creating large nested collections with many fields.

1. Clone repository
2. Run: composer install
3. Run: php bin/reproduce_memory_issue.php

The script creates a deeply nested form structure:

• 1 location containing 20 sublocations
• Each sublocation contains 20 buildings
• Each building contains 101 fields (1 number field + 100 text fields)
• Total: ~40,400 form fields

This results in:

• ~463 MB memory increase during form creation
• ~2.7 seconds to create the form

The addition of options to the fields in BuildingType (specifically 'attr' => ['foo' => 123]) significantly contributes to the memory usage.

The standalone script can be used with various profiling tools:

# Basic run
php reproduce_memory_issue.php