What is Latency?

How Latency Works

Network latency is built from four components: propagation delay (the physical travel time of signals through fiber and radio, bounded by distance), transmission delay (pushing bits onto the wire), processing delay (routers and servers handling packets), and queuing delay (waiting in buffers under load). It is normally quoted as round-trip time — the interval between sending a packet and receiving its reply.

Protocols multiply the cost of each round trip. Opening a TCP connection takes one RTT before any data flows; a TLS handshake adds one or two more; only then does the HTTP request go out and the first byte of the response come back. A single HTTPS request on a fresh connection can therefore spend several round trips before delivering anything, which is why time to first byte is often several multiples of raw ping time.

A proxy adds a hop: the client-to-proxy leg and the proxy-to-target leg each contribute their own RTT. Exit type matters too — residential and mobile exits route through real home or cellular connections whose last mile adds delay and variance, while datacenter routes tend to be shorter and steadier.

Why It Matters for Proxies and Scraping

Latency caps sequential throughput. If a request takes 500 ms end to end, one connection can complete only about two requests per second no matter how much bandwidth is available; the connection spends its life waiting. Latency also drives timeout tuning: thresholds set for a fast path will misfire on residential routes and produce spurious retries that waste requests and inflate error rates.

Placement is the main lever. Picking exit locations near the target service shortens the longest leg of the path; on ProxyOmega ports, country targeting through the -country-us style username parameter lets you choose exits in the target's region. Reusing connections with keep-alive then amortizes handshake round trips across many requests.

Practical Notes and Common Misconceptions

Latency and bandwidth are independent: a connection can move huge volumes yet feel slow to start, or start instantly yet trickle. Measure percentiles rather than averages — a median of 200 ms with a p95 of 3 seconds behaves very differently from a steady 300 ms — and watch jitter, the variation between requests, which destabilizes pipelines more than a constant delay does.

A proxy does not automatically mean painful delay. A well-placed proxy adds one modest hop, and routing through an exit near the target can even shorten the total path compared with fetching directly from far away.