opticalist
Registered Member
- Aug 26, 2026
- 94
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What can make a proxy slow or stop working? Has anyone had this issue before? What should I check first?
What causes a proxy to become slow or stop working?
- Thread starter opticalist
- Start date
spaciousabhi
Junior Member
- Nov 5, 2023
- 104
- 29
i usually try to separate where the problem actually is first
if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP
and if it gets bad only at certain hours id suspect congestion or an overloaded pool
if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP
and if it gets bad only at certain hours id suspect congestion or an overloaded pool
Well, Proxies usually fail due to server overload, target-site IP bans, or geographic distance.
- May 13, 2013
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A proxy can become slow for a number reasons but you should first isolate some circumstances. A particular site blocking your proxy can cause it to slow because it will be auto-looping to get clear traffic. Server overload is another reason. If none of this is the case, your proxy provider might be running maintenance and might need to contact HR.
spaciousabhi
Junior Member
- Nov 5, 2023
- 104
- 29
i usually try to separate where the problem actually is first
if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP
and if it gets bad only at certain hours id suspect congestion or an overloaded pool
if every site is slow its probably the proxy/provider side. if only one site has problems then it could be that site throttling or blocking the IP
and if it gets bad only at certain hours id suspect congestion or an overloaded pool
DevArchitect
Newbie
- Jul 29, 2026
- 49
- 10
It's usually one of two things: concurrent connection limits or the entire subnet being flagged. If you're running heavy multi-threading on scrapers, the provider's gateway will throttle you. Also, cheap shared datacenter proxies share the same C-class IPs; if someone else on your pool gets flagged by Cloudflare, your requests get blocked along with theirs.
Zl0y
Registered Member
- Nov 16, 2024
- 66
- 14
Is the proxy server yours? Or are you using proxies from a provider?
In the first case, check the logs.
In the second, just accept it and buy new ones. Proxies die -after all, they are shared among many people.
Oh, and you can also check the proxies using a DNS nativeness checker. It will reveal any potential issues. Google is your friend.
In the first case, check the logs.
In the second, just accept it and buy new ones. Proxies die -after all, they are shared among many people.
Oh, and you can also check the proxies using a DNS nativeness checker. It will reveal any potential issues. Google is your friend.
- Mar 2, 2021
- 4,348
- 1,414
for me it happens when i am working on high concurrency and large payloads
- Aug 9, 2025
- 123
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First check if it's the proxy or your setup: run a quick speed/IP check with and without the proxy, and make sure your auth details and port are still right. If it's the proxy, the usual causes are an overloaded shared IP, a rotation or reconnect happening mid-session, or bad signal and uptime on the provider's side (with mobile proxies it's often the device or SIM), so a stable dedicated IP and a provider who actually answers support messages make a big difference.
- Oct 19, 2025
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usually it is an overloaded proxy, bad routing, a provider issue or the target site limiting that IP. Test the proxy on a few different sites first. If it is slow everywhere, the problem is probably the proxy or provider. If it only fails on one site, the IP may be blocked or rate limited.
I would also try another IP from the same provider to see if it is just one bad endpoint
I would also try another IP from the same provider to see if it is just one bad endpoint
There are many reasons why a proxy becomes slow. Sometimes it's just the network. Other times, it's also because the proxy becomes overloaded. One thing you can test is whether the proxy becomes faster when you reduce its workload or number of active connections.
- Nov 2, 2008
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possibly due to to much traffic on the ip .
- Apr 13, 2025
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if it's a mobile proxy i'd test the phone's own mobile data speed first, without the proxy. if that's already slow then signal or carrier congestion could be the problem. if the phone is fast but the proxy isn't, then i'd start checking the gateway and connection limits.
securespend
Registered Member
- Oct 5, 2026
- 51
- 4
I think the proxy depends on the quality of the server, the internet connection and the number of people using it. Some common signs of slow speeds can be sending too many requests to the same IP, the proxy server is too far from you, using a free or cheap proxy that has thousands of people on it at once, or the target website blocking that IP. To check for this problem, first check your internet, then try using another proxy and use an IP checker to see if the proxy is leaking.
The exact error would help narrow this down. A 407 response means proxy authentication needs attention; a 429 means the responding server is rate-limiting you, so reduce the request rate and respect Retry-After if it is present. Neither is the same as a connection timeout.
For a useful support report, record the time, proxy endpoint, HTTP status or exact timeout message, and whether a single request to a second unrelated site also fails. Remove passwords and tokens before sharing logs. That gives the provider something reproducible to investigate instead of just 'the proxy is dead'. Which error are you seeing?
For a useful support report, record the time, proxy endpoint, HTTP status or exact timeout message, and whether a single request to a second unrelated site also fails. Remove passwords and tokens before sharing logs. That gives the provider something reproducible to investigate instead of just 'the proxy is dead'. Which error are you seeing?
Something that gets missed is that some targets slow you down on purpose instead of blocking you. You get 200s but with several seconds of delay, so it looks exactly like a bad proxy. Easy way to tell is to hit a neutral endpoint through the same proxy at the same time, if that's fast and the target is slow, it's the target throttling that IP.
If it's slow everywhere, compare connect time against time to first byte. High connect time points to the gateway or your route to it, high TTFB with fast connect usually means a weak exit node, which is common with residential peers on bad home connections. With rotating setups just retrying for a new exit often fixes it. Also check whether DNS resolves locally or on the proxy side, since that can change both speed and geo results.
If it's slow everywhere, compare connect time against time to first byte. High connect time points to the gateway or your route to it, high TTFB with fast connect usually means a weak exit node, which is common with residential peers on bad home connections. With rotating setups just retrying for a new exit often fixes it. Also check whether DNS resolves locally or on the proxy side, since that can change both speed and geo results.