Changing the Java Heap Size
The Java™ heap size determines how much memory should be reserved for the JVM process. By default, Webform Server sets both the initial and the maximum Java™ heap size (-Xms and -Xmx settings) to 50 MB, although the default -Xms and -Xmx values are blank. This should be sufficient for most Webform Server deployments.
Measuring a form's size in memory
You can measure the size of a form in memory, and use this value to determine an appropriate setting for the Translator's form cache (fcCacheSize).