public B preheat(int iterations) {
            failIfAlreadyBuilt();
            this.preheatIterations = iterations;
            return (B)this;
        }
Use the available testcases to preheat the jvm on this analyzer.
@param iterations How many testcases must be run
@return the current Builder instance.
analyzer/src/main/java/nl/basjes/parse/useragent/AbstractUserAgentAnalyzerDirect.java