@doremifajb Those two commands are the way I updated my Armbian OS, done as root, hence the # prompt. Should be very similar for Raspian.

I think we need to understand how many files and folders are recursively located in the directory he's trying to list. We also need to know if the application he's using is trying to build thumbnails...

@KMPLSV Can you not replace the Guest tickbox with a small group of ACLs in your pfSense? Order of rules is usually important. 1. block Guest_DHCP_Pool <-> Guest DHCP_Pool (IP group) communication 2....

@Icaro Ok, leave the MRU alone (reset to default value as your internal devices won't likely care), set only the MTU to 1400 (to control your outbound fragmentation) and reboot your router. Validate.

SMB is a notoriously inefficient protocol for file sharing, I think what you are seeing is just the increased latency over the VPN tunnel multiplied by the 100's of requests needed to populate the...

@Icaro Did you power cycle the router after making these changes?