To speed up SMB file browsing, you can prevent macOS from reading .DS_Store files on SMB shares. This makes the Finder use only basic information to immediately display each folder's contents in alphanumeric order. Use this Terminal command:

```bash 
defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool TRUE`

Then log out of your macOS account and log back in.

To reenable sorting, use this command:

`defaults write com.apple.desktopservices DSDontWriteNetworkStores -bool FALSE`

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