Historically toolkit a class switches off JIT compilation. It is necessary to check why we do it, and how performance is affected.
See java.awt.Toolki.java
    public static synchronized Toolkit getDefaultToolkit() {
........................
                // We disable the JIT during toolkit initialization. This
                // tends to touch lots of classes that aren't needed again
                // later and therefore JITing is counter-productiive.
                java.lang.Compiler.disable();
.......................
                // Make sure to always re-enable the JIT.
                java.lang.Compiler.enable();