Network traffic between two projects without Private Service Connect

Google Cloud Compute Infrastructure
1

Hi,

My team is working on a service integration with another company who is also on GCP, this integration required a low-latency connection, so we proposed to use Private Service Connect. But the vendor company said it’s not necessary. They clarified as follow: “As long as both parties are on GCP, with or without the PSC, the traffic between two projects will remain within the Google network and doesn’t use the public internet routes”
I couldn’t find any documentations to prove or disprove the point. Can anyone provide more explanation?

2

Hello @kzhang ,

PSC adds minimal latency as you can read here https://cloud.google.com/network-intelligence-center/docs/performance-dashboard/how-to/view-google-cloud-latency explaining that PSC itself adds minimal latency. The main processing happens on the destination VMs.

While there might not be a document directly comparing latency with and without PSC, resources like https://cloud.google.com/vpc/docs/private-service-connect explain PSC’s architecture and minimal latency impact.