TLShandshake causes high cpu usage in BigInteger.montReduce

High CPU utilization for RSA handshakes. JFR stack capture stats :

Stack Trace Sample Count Percentage(%)
java.math.BigInteger.montReduce(int[], int[], int, int) 498 7.366
java.math.BigInteger.oddModPow(BigInteger, BigInteger) 498 7.366
java.math.BigInteger.modPow(BigInteger, BigInteger) 498 7.366
sun.security.rsa.RSACore.crtCrypt(byte[], RSAPrivateCrtKey) 491 7.262
sun.security.rsa.RSACore.rsa(byte[], RSAPrivateKey) 491 7.262
com.sun.crypto.provider.RSACipher.doFinal() 473 6.996
com.sun.crypto.provider.RSACipher.engineUnwrap(byte[], String, int) 459 6.789
javax.crypto.Cipher.unwrap(byte[], String, int) 459 6.789
sun.security.ssl.RSAClientKeyExchange.<init>(ProtocolVersion, ProtocolVersion, SecureRandom, HandshakeInStream, int, PrivateKey) 459 6.789
sun.security.ssl.ServerHandshaker.processMessage(byte, int) 459 6.789
sun.security.ssl.Handshaker.processLoop() 459 6.789
sun.security.ssl.Handshaker$1.run() 459 6.789
sun.security.ssl.Handshaker$1.run() 459 6.789
java.security.AccessController.doPrivileged(PrivilegedExceptionAction, AccessControlContext) 459 6.789
sun.security.ssl.Handshaker$DelegatedTask.run() 459 6.789
weblogic.socket.JSSEFilterImpl.doTasks() 459 6.789
weblogic.socket.JSSEFilterImpl.doHandshake(ByteBuffer, MuxableSocket, boolean) 459 6.789