@ChuckPa as an FYI.
For me at least the issue is now resolved and I’m back to normal speedy scan speeds.
The problem was caused by a regression in kernel 5.19.0-35 which is now fixed in 5.19.0-38. Looking at the change log from UbuntuUpdates - Package "linux-modules-5.19.0-38-generic" (kinetic 22.10) it appears there was nfs deadlocks & cache timing issues.
Anyhow, issue resolved so marking as such.
