this is what experienced: we did not encounter the slowness on 8.1.7, running for months we upgraded to 8.1.13, running for a couple of weeks, did not noticed the issue, it could have been there but we just did not notice it. we upgraded to 9.0.8 and the smb traffic is much slower. applied the app-id override and this seems to have resolved the performance issues. none of the other suggestions was able to address the slowness except for the app-id override. the strange part is that we have multiple firewalls that in this case the smb traffic traverses and we only have to apply the app override on one of them. so fw1 has the app override, fw2 is processing the smb traffic as normal and this seems to be fine in our environment. i do have a case open with tech to find more info.
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