Symfony 4.0

	Benchmark		Config		Concurrency 1		Concurrency 5		Concurrency 10		Concurrency 20		Score
	Hello world				1.2 ms	856 rq/sec	0.9 ms	5,743 rq/sec	1.6 ms	6,249 rq/sec	3.2 ms	6,176 rq/sec	10,896
	REST API				2.3 ms	435 rq/sec	2 ms	2,542 rq/sec	3.6 ms	2,750 rq/sec	7.3 ms	2,740 rq/sec	13,785

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.