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Slow index performance when using T-correlatives 

Previous Release Behavior

The performance of indexes being built with T-correlatives was very slow. This performance drag was also noticeable with jQL queries that didn't use indexes but used T-correlatives. 

The problem was found that 

  • Windows is just plain slow on some system calls, such as stat(), open() and fstat().  
  • The T-correlative always opened 2 or 3 more files than necessary. This was in anticipation of some of the @xyz variables that needed the current file. 

Current Release Behavior

There is now a cache of the 10 most recently files OPEN'd, which can give up to a 24x performance improvement.

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