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perf(platform-server): use shared `DomElementSchemaRegistry` instance (…
…angular#28150) (angular#28151) Right now the `ServerRendererFactory2` creates a new instance of the `DomElementSchemaRegistry` for each and every request, which is quite costly (for the Tour of Heroes SSR this takes around **30%** of the overall execution time). Since the schema is never modified, but only used in a read-only fashion, it should be possible to re-use a single instance instead. Naive performance testing with 100 concurrent connections and 1000 requests in total shows an approximate **33%** improvement in Req/Sec on the Tour of Heroes SSR example. PR Close angular#28150 PR Close angular#28151
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