Please implemnt a Blocksize Setting to get more than 32K for a Flashbackup restore in Windows.
The support told me, that FBU_READBLKS is only implemented in Unix and will be used when restoring filesystemes
The windows setting "raw partition read buffer size" is only used by backups and not for restores.
The same setting is used for vmware policies to speed up SAN backups, but restores will also use the default of 32K blocksize.
Example of Life Systems:
2 Streams with flashbackup = 280 MB/Sec (readbuffersize=2M)
2 Restorestreams to rawdevice = 80 MB/Sec (32K default is used)