In addition to increasing the JVM heap size, you can perform few more tuning to developer toolkit to improve the performance of development toolkit.
Tuning Apache Derby Database
Derby is a filesystem based database, there are few minor configuration changes that can be
performed on the toolkit Derby properties to improve overall performance of the WCS Developer Toolkit.
The file is located in following location for WCS V7:
IBM\SDP\runtimes\base_v7\derby\derby.properties
With this Derby will be able to access data from cache instead of filesystem, this will reduce overall I/O as data will be read from the cache.
derby.storage.pageCacheSize = 10000
derby.storage.pageSize = 8192
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