Reduce the no. of copies in Tess_SurfaceMD5.
Reduce the no. of copies in Tess_SurfaceMD5.

This is a minor optimisation with an expected slight speed improvement.
It doesn't address the real problem here, which is the no. of calculations.

DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon,DaemonEngine/Daemon