Update 14 was essentially a "feature backport" release. By including G1 and compressed pointers, Sun gave developers a preview of the performance gains coming in Java 7 while maintaining the stable environment of Java 6.
: Update 14 marked the first time the G1 collector was available to the public. It was designed to replace the Concurrent Mark-Sweep (CMS) collector, offering better predictability and reduced heap fragmentation through incremental compaction. J2Se 6 Update 14
Java SE 6 Update 14 Release Notes. - Oracle Update 14 was essentially a "feature backport" release
: The release addressed over 350 bugs , making it a critical stability update for enterprise environments. It was designed to replace the Concurrent Mark-Sweep
: The -XX:+UseCompressedOops option was introduced to improve the performance of 64-bit JREs on heaps smaller than 32GB. It allows 64-bit JVMs to use 32-bit references, reducing memory footprint and improving cache efficiency.