Every IP address block is registered at a regional internet registry to some organisation. A datacentre address is registered to a hosting company; a residential address is registered to a consumer broadband carrier — AT&T, Comcast, China Telecom. That registration is a matter of public record, and it is the first thing a platform checks when it decides how much to trust your traffic. A residential IP VPS is simply a server sitting on an address of the second kind.
What it changes is how you are scored, not how fast you are. A datacentre address is cheap and plentiful, which is exactly why fraud systems treat it as suspicious: almost nobody browses a shopping site from a rack in Frankfurt. A residential address carries no such signal. That is the whole value — and it is why a residential plan can cost several times what an equivalent datacentre box costs for the same CPU and RAM.
When you do not need one: hosting a website, running an API, backups, a jump box. Those workloads care about bandwidth and route quality, and nobody is scoring the address. Paying a residential premium there is money spent on nothing. When you do need one: registering or running accounts on platforms with real fraud scoring, working with region-locked services, anything where the other end looks up who owns your address.
Verify before you commit. Ask the provider for a test IP and check two things yourself: which carrier announces the address, and whether the registration country matches where the server actually sits. Both take a minute, and both are things a provider can claim on a product page at no cost. Most providers support a short refund window — use the first day.