For high-load, web-scale applications, C# and ASP.NET Core are the more proven performance choice, not Delphi. Delphi's natively compiled Object Pascal can match or beat C# on raw, single-machine compute, but once "high-load" means thousands of concurrent connections, ASP.NET Core's Kestrel server and built-in async I/O model are built specifically for that kind of scale.
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