# Concurrent connections

Concurrent connections, often called threads in proxy marketing, are the number of simultaneous connections a customer may keep open through a proxy service. Some providers cap them per plan; others, Proxy Cyber included, leave them unlimited and bill only traffic or addresses. The practical limit is then the target's tolerance and the size of the pool in the location you use.


## What concurrency buys

Throughput. A crawler that waits 800 ms per page collects 75 pages a minute on one connection and 7,500 on a hundred. On a rotating pool each connection is also a different exit, so concurrency and rotation grow together.


## Where the real ceilings are

- The target: per-domain politeness matters more than the proxy's limits.
- The pool: 500 concurrent Berlin sessions need 500 Berlin households online at that moment.
- Your client: open file descriptors, DNS, and connection pools are usually exhausted before the proxy is.


## How it works at Proxy Cyber

Proxy Cyber sets no limit on concurrent connections or sessions on any network; residential and mobile are billed per GB, dedicated addresses per IP.

Source: https://proxy-cyber.com/glossary/concurrent-connections