(Now that Boot_WB's problem is resolved)
@Piru
Speaking of your Exec, are all the functions of the library optimized, or "only" those which are mentioned in the changelog? If this is the case, i suppose it's good to use it in conjunction with SystemPatch by excluding the patches which are optimized in exec44 and leave those which are not.
Also, SystemPatch docs says that "It replaces BLIT, PORTS, SOFTINT interrupt routines.". Exec44 does this?