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Test environment: LAN
UDP: Don't know, Disable UDP Acceleration is not selected
VPN Server: Intel Core i5-9400F
Samba Server: Intel Celeron N4500
Client: Intel Xeon E3-1231v3
No SSL / Compression on both side
No SSL / Compression only Samba to VPN Server
No SSL / Compression only VPN Server to Client
No SSL / No Compression
SSL / No Compression
No VPN (Direct connection between Samba and Client)
Conclusion: In LAN environment, connect Samba and Client as direct as possible.
Add VPN Compression won't increase performance if router total bandwidth is limited.
No SSL / Compression on both side
No SSL / Compression only Samba to VPN Server
No SSL / Compression only VPN Server to Client
No SSL / No Compression
SSL / No Compression
No VPN (Direct connection between Samba and Client)