What is MTU in VPN settings, and how does tuning it speed up internet?

IT IS THE MAXIMUM PACKET SIZE THAT PREVENTS FRAGMENTATION AND LATENCY IN THE LINK.

Encryption adds service headers, causing standard data packets to exceed the network's allowed size. Incorrect settings force routers to chop every packet into pieces, degrading real transfer speeds.

Impact of Packet Size on Connection Stability

Standard maximum transmission units (MTU) in Ethernet networks equal 1500 bytes. When a security tunnel is applied, size increases, and packets no longer fit into the ISP's channel: forced fragmentation occurs, leading to packet loss, slow page loading, and video stream drops.

How to Configure Optimal Block Size

Lower the MTU value in network adapter or client settings down to 1280–1360
Run a ping test with the don't-fragment flag to find your exact threshold
Test the connection after changing parameters while streaming heavy video
Revert to default values if your network uses a direct, loss-free optical connection