要解决为何如此缓慢的问题，您首先需要找出发生缓慢的地方.同一VNET中的VM是否也具有相同的速度?如果是这样，则问题可能出在VM而不是VPN.

To troubleshoot why this is so slow, you first need to isolate where the slowness is occurring. Do VMs in the same VNET also experience the same speeds? if so, the problem is likely with the VM and not the VPN. 

即使低端VPN网关也应能够维持 100mb/s .如果您认为自己可能已接近此限制，则可以尝试将VPN SKU设置为更大. 

Even the low end VPN gateways should be able to sustain 100mb/s. If you believe you might be near this limit, you can try to size up to a larger VPN SKU.