When:

• configuring objects to be lazily loaded using the ObjectDefinitionHelper as suggested in the docs:

//definitions.php
array(
    Class1::class => object()->lazy(),
    Class2::class => object()->lazy(),
    ClassN::class => object()->lazy(),
)

• storing the Definitions in a file and adding them like $builder->addDefinitions('definitions.php');
• using the ocramius\proxy-manager
• configuring the DI builder to write the proxies to a file: writeProxiesToFile(true, '/folderName')

Then:

• no files are actually generated in the indicated folder
• performance drops significantly.

When switching back to non-lazy configured objects, performance is back to normal again. After browsing around in the source code, it seems a FileWriterGeneratorStrategy should also be set explicitly, since it defaults to an EvaluatingGeneratorStrategy which removes the generated files afterwards

Adding one line to the ProxyFactory

$config->setGeneratorStrategy(new FileWriterGeneratorStrategy(new \ProxyManager\FileLocator\FileLocator($this->proxyDirectory)));

Also opened #412