core: warn when extensions affected perf (#5666)
core: warn when extensions affected perf (#5666)


ev1stensberg/lighthouse,mixed/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,wardpeet/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,umaar/lighthouse,deepanjanroy/lighthouse,mixed/lighthouse,umaar/lighthouse,GoogleChrome/lighthouse,wardpeet/lighthouse,GoogleChrome/lighthouse,mixed/lighthouse,GoogleChrome/lighthouse,ev1stensberg/lighthouse,ev1stensberg/lighthouse,ev1stensberg/lighthouse,wardpeet/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,wardpeet/lighthouse,mixed/lighthouse