Investigate potentially serious performance implications of seemingly unnecessary thread-per-log message logging implementation

[sming]

So the serializeAndLog method is called by all "log this sentence to disk" methods in the Slf4jQueryLogger class.

This is incredibly wasteful as for every single line of the log file, a Thread is created and destroyed, which includes :

• a Thread object being allocated and GC'd
• all the trappings of a Thread object e.g. file handles, OS resources
• the actual OS thread that the Thread represents
• other stuff I've forgotten

We should - at the least - run some tests to determine how slow/wasteful this is, assuming realistic logging rates.

My money is that it's really bad and could have a significant effect on performance, assuming that these logging methods are called frequently enough.