FULL PRODUCT VERSION :
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b91)
Java HotSpot(TM) 64-Bit Server VM (build 1.9.0-ea-b91, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
I have a Java program which makes use of JSR-223 and JavaScript. It calls ScriptEngine.eval() multiple times as it is processing user provided JavaScript to process templates - each template has multiple script blocks which are each evaluated and the template is processed multiple times for multiple rows of data. I have noticed that Java 8 (Nashorn) is significantly slower in comparison to Java 7 (Rhino) when evaluating JavaScript. Hoping the the performance might have been improved with Java 9, it appears to be 3x slower on Build 91.

Possible duplicate of JDK-8034959, but it hasn't been commented on since 2014 and I am seeing even worst performance in Java 9.

REGRESSION. Last worked in version 7u80

ADDITIONAL REGRESSION INFORMATION:
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the attached program under Java 7, Java 8 and Java 9 to see the difference.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I understand that Nashorn takes more time to eval code as it compiles the code first to try and improve performance of the script itself. This has a negative impact on use cases that use a lot of evals.

I would expect to see similar results to Rhino, but I would expect the same or better performance with Java 9 compared to Java 8.
ACTUAL -
D:\Scripts>java7 SSCCE
Warming Up...
Starting...
Elapsed Time: 0.58447784

D:\Scripts>java8 SSCCE
Warming Up...
Starting...
Elapsed Time: 5.0787277

D:\Scripts>java9 SSCCE
Warming Up...
Starting...
Elapsed Time: 12.828292

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.script.*;

public class SSCCE {
  public SSCCE() {
    ScriptEngineManager sem = new ScriptEngineManager();
    ScriptEngine js = sem.getEngineByName("JavaScript");
    long t = 0;
    int i = 0;

    String gJs = "function ip2long(ip) {";
    gJs += "var aIP = ip.split(\".\");";
    gJs += "return (aIP[0] * Math.pow(256, 3)) + (aIP[1] * Math.pow(256, 2)) + (aIP[2] * 256) + (aIP[3] * 1);";
    gJs += "}";
    gJs += "function long2ip(l) {";
    gJs += "if (!isNaN(l) && ((l >= 0) || (l <= Math.pow(2, 32)))) {";
    gJs += "return Math.floor(l / Math.pow(256, 3)) + \".\" +";
    gJs += "Math.floor((l % Math.pow(256, 3)) / Math.pow(256, 2)) + \".\" +";
    gJs += "Math.floor(((l % Math.pow(256, 3)) % Math.pow(256, 2)) / Math.pow(256, 1)) + \".\" +";
    gJs += "Math.floor((((l % Math.pow(256, 3)) % Math.pow(256, 2)) % Math.pow(256, 1)) / Math.pow(256, 0));";
    gJs += "}";
    gJs += "return null;";
    gJs += "}";

    try {
      js.eval(gJs);
    }
    catch (Exception e) {
      e.printStackTrace();
    }

    System.out.println("Warming Up...");

    t = System.nanoTime();

    for (i = 0; i < 4097; i++) {
      try {
        String sJs = "var ip = \"192.0.2.0\";";
        sJs += "var nip = long2ip(ip2long(ip, " + i + "));";
        js.eval(sJs);
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }

    System.out.println("Starting...");

    t = System.nanoTime();

    for (i = 0; i < 4097; i++) {
      try {
        String sJs = "var ip = \"192.0.2.0\";";
        sJs += "var nip = long2ip(ip2long(ip, " + i + "));";
        js.eval(sJs);
      }
      catch (Exception e) {
        e.printStackTrace();
      }
    }

    System.out.println("Elapsed Time: " + (System.nanoTime() - t) / 1000000000.0f);
  }

  public static void main(String[] args) {
    new SSCCE();
  }
}
---------- END SOURCE ----------