Advanced!
Apparently there are a a few bugs in OSX when it comes to accessing a network drive. This was really slowing down my Synology NAS which I use to host my video and audio files. To fix it, create the following file in /etc/nsmb.conf
# /etc/nsmb.conf - macOS 10.13 - 2018-05-20
#------------------------------------------------------------------------------
# More information:
# https://support.apple.com/en-us/HT208209
# https://apple.stackexchange.com/questions/309016/smb-share-deadlocks-since-high-sierra
jbfriedrich/nsmb.conf
#------------------------------------------------------------------------------
[default]
# Use NTFS streams if supported
streams=yes
# Soft mount by default
soft=yes
# Disable signing due to macOS bug
signing_required=no
# Disable directory caching
dir_cache_off=yes
# Lock negotiation to SMB3 only
# 7 == 0111 SMB 1/2/3 should be enabled
# 6 == 0110 SMB 2/3 should be enabled
# 4 == 0100 SMB 3 should be enabled
# 2 == SMB2 only
# protocol_vers_map= choose 2 or 4
protocol_vers_map=4
# Turn off notifications
notify_off=yes
Thats it!
If you want to research what all that does, here are the links:
https://support.apple.com/en-gb/HT205926
https://community.synology.com/enu/forum/7/post/119623?page=2&sort=oldest
https://support.apple.com/en-au/HT204021
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