In 5.1 support for PHP attributes was added and the default doctrine annotations reader was replaced. This change slows down our systems by almost 100%, i.e. rendering a page takes almost twice as long.
If we replace in services.yaml the new annotation reader arguments ("@ambta_doctrine_annotation_reader") with the default one from doctrine "@annotation_reader" the system is fast again.
@flavou45 do you have any idea why this is? Could this be annotation caching issue?