scala nsc IMain bind() speed and memory issues - scala

Question

We are using tools.nsc.interpreter.IMain's bind() and interpret() method to execute scala scripts on a server. This is on on scala 2.9.1 and Java 7u2.
After repeatedly using the same IMain instance, the bind() methods suddenly starts to take very long time (5-6 seconds and even longer). I have tried close() reset() but nothing helps. Weird thing is that the sudden slowness occurs after several uses.
Code snippet (that is executed over and over again):
main.bind("status", status)
try {
main.interpret(prepare(restriction, input))
} catch {
case e: Exception =>
status.setCode("ERR6")
status.setSummary("Error Interpreting Restriction")
status.setType(MetaFileElements.ERROR_VALUE)
status.setValue("Restriction: \"" + restriction + "\", Input: \"" + input + "\"")
}
Another Issue is evetually the process crashes with this error:
Exception in thread "main" java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClassOrNull(ClassLoader.java:1061)
at java.lang.ClassLoader.loadClass(ClassLoader.java:412)
at java.lang.ClassLoader.loadClass(ClassLoader.java:410)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at scala.tools.nsc.util.Exceptional$.unwrap(Exceptional.scala:140)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$handleException$1$1.apply(IMain.scala:821)
at scala.tools.nsc.interpreter.IMain$Request$$anonfun$handleException$1$1.apply(IMain.scala:818)
at scala.tools.nsc.interpreter.IMain$$anonfun$withoutBindingLastException$2.apply(IMain.scala:228)
at scala.util.control.Exception$Catch.apply(Exception.scala:88)
at scala.tools.nsc.interpreter.IMain.withoutBindingLastException(IMain.scala:226)
at scala.tools.nsc.interpreter.IMain$Request.handleException$1(IMain.scala:818)
at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:838)
at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:471)
at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:503)
at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:468)
at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:525)
at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:544)
at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:545)
at com.nomura.fi.spg.kozo.meta.client.helper.RestrictionsHelper$.execute(RestrictionsHelper.scala:22)