Proxy
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Yes — proxies often increase response time, but the extent depends on several factors. Here’s why and how:
Why a Proxy Can Increase Response Time
Additional Network Hops When you use a proxy, your request detours through an intermediary server before reaching the destination. This adds at least one network hop.
Processing Overhead Proxies sometimes:
Inspect, log, or modify requests/responses.
Perform caching or load balancing.
Apply security measures like firewall rules or TLS termination.
All these add processing time.
Congestion or Load If the proxy is overloaded, queued, or poorly optimized, it can bottleneck traffic and delay responses.
Encryption/Decryption SSL/TLS termination or re-encryption at the proxy can add milliseconds (though usually small).
When Proxies Might Not Significantly Affect Performance
Lightweight Layer 4 (TCP) proxies just forward packets and add minimal delay.
Proxies close to the application server (same data center or LAN) add negligible latency — often just a few milliseconds.
Caching at the proxy can actually reduce response time (e.g. if the proxy returns a cached response instead of fetching from the backend).
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