Symfony 3.3

	Benchmark		Config		Concurrency 1		Concurrency 5		Concurrency 10		Concurrency 20		Score
	Hello world				2 ms	507 rq/sec	1.5 ms	3,236 rq/sec	3 ms	3,355 rq/sec	6.1 ms	3,275 rq/sec	6,039
	REST API				3.2 ms	312 rq/sec	3 ms	1,692 rq/sec	5.9 ms	1,700 rq/sec	11.6 ms	1,728 rq/sec	9,117

Performance tools

Get Doctrine stats : managed entities, lazy loaded entities, hydration time etc.

steevanb/doctrine-stats

Add SimpleObject and ReadOnly hydrators do Doctrine (3,5x faster).

steevanb/doctrine-read-only-hydrator

Add hint MERGE_ENTITY to merge fields retrieved by many queries with PARTIAL.

steevanb/doctrine-entity-merger

View Symfony Container instantiated services, public / private services etc.