レジストリの位置
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Executive
AdditionalCriticalWorkerThreads
AdditionalDelayedWorkerThreads
双方ともデフォルトは0
VsitaPC(6400+)
AdditionalCriticalWorkerThreads 7
AdditionalDelayedWorkerThreads 3
参考
PC-ZERO様
http://pc-zero.jp/cp_explain/cp_explain_1_1_2.html