public static void estimateKeyDerivationTime() { // This is run in the background after startup. If we haven't recorded it before, do a key // derivation to see // how long it takes. This helps us produce better progress feedback, as on Windows we don't // currently have a // native Scrypt impl and the Java version is ~3 times slower, plus it depends a lot on CPU // speed. checkGuiThread(); estimatedKeyDerivationTime = Main.instance.prefs.getExpectedKeyDerivationTime(); if (estimatedKeyDerivationTime == null) { new Thread( () -> { log.info("Doing background test key derivation"); KeyCrypterScrypt scrypt = new KeyCrypterScrypt(SCRYPT_PARAMETERS); long start = System.currentTimeMillis(); scrypt.deriveKey("test password"); long msec = System.currentTimeMillis() - start; log.info("Background test key derivation took {}msec", msec); Platform.runLater( () -> { estimatedKeyDerivationTime = Duration.ofMillis(msec); Main.instance.prefs.setExpectedKeyDerivationTime(estimatedKeyDerivationTime); }); }) .start(); } }