Found this oddity when benchmarking Leyden. JDK 23 is behind JDK 17, 21 on basic Leyden reproducer. I bisected the major source of this regression to JDK-8309622. A related JDK-8331932 improved the startup overheads a bit, but not completely.

Here:

```
% cat HelloStream.java
import java.util.*;
import java.util.stream.*;

public class HelloStream {
    public static void main(String ... args) {
        var words = List.of("hello", "fuzzy", "world");
        var greeting = words.stream()
            .filter(w -> !w.contains("z"))
            .collect(Collectors.joining(", "));
        System.out.println(greeting); // hello, world
    }
}

% rm -f *.class *.jar
% $J/bin/javac HelloStream.java
% $J/bin/jar cf hellostream.jar *.class

% hyperfine -w 50 -r 100 '$J/bin/java -Xmx256m -XX:+UseSerialGC -cp hellostream.jar HelloStream'
```

jdk-23+0: 37.2 ms ± 0.2 ms
Before JDK-8309622: 37.1 ms ± 0.3 ms
At JDK-8309622: 38.5 ms ± 0.3 ms
At JDK-8331932: 37.8 ms ± 0.3 ms