Group: Forum Members
Note this may affect image backups as well and probably does but since image backups are so fast anyway I didnt test on that.
So here is my data.
Up until February this year I was running Windows 8.1 which has no Control Flow Guard protection in the OS, so Macrium was not utilising it, my FF7 mods folder which I backup via F&F and using incremental backups on average took about a minute to run when either no or little file updates, time spent scanning for changes, files are hosted on SATA SSD.
I then moved to Windows 10, and the same backup suddenly started taking over 20 minutes, I watched task manager, and most of the time was on cpu cycles, the read speeds on the SSD were a trickle, so in other words the backup was cpu constrained, I have a 9900k, but the F&F doesnt utilise more than one core.
I then learnt last week about the impact of some mitigations on performance, and that Control Flow Guard itself can absolutely savage performance, I then set a override for reflectbin.exe and just had a incremental backup (with no file changes) completed in just 40 seconds. More in line with the Windows 8 performance. CPU still bottlenecked but the read speeds had shot right up much closer to what the SSD is capable of on 4k random i/o.
Given that reflect is not really an attack vector, I will keep CFG off on reflectbin.exe.
Hope this information helps others.