This time, it is Preview #1 (Build 14) of the Java generator for GeneXus 9.0 U6. It can be downloaded, together with its corresponding documentation, at the GXtechncial Download Center. Several generation-time optimizations have been done. In KBs which have transactions with many rules, and objects which use many SDTs and Business Components, generation time has been reduced to almost 40%. Optimizations in the reading of .ari files and the generation of SDT sources have also been implemented.