performance tuning

Multi-threading has been reworked to improve responsiveness of the server under considerable load. Private pool threads are used in many places so as to take the pressure off a global pool thread. On machines with Hyper-Threading enabled the number of cores used by fits_web_ql will be halved (the physical, not logical, count will be used).

Hyper-Threading has been implicated in reducing the overall responsiveness of servers under heavy load. A personal recommendation would be to disable Hyper-Threading completely in BIOS wherever possible.