Issues with Bitcoin Core Hogging Bandwidth

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Posts: 36 · Reputation: 19
#1Nov 10, 2025, 02:11 PM
So... whenever I run Bitcoin Core, my connection goes down the drain. Can’t even use other apps, like seriously. Even my phone shows "Connected, no internet"! Is that normal? When I close it, everything's fine again.
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0xHodlerMember
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#2Nov 11, 2025, 02:56 PM
Sounds about right, it’s pretty heavy software. But I get you, maybe try limiting the download speed with something else. It hogs bandwidth while syncing, but once done, it could ease up.
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#3Nov 11, 2025, 03:52 PM
Right? Like everything just freezes till I close it. I thought limiting the bandwidth would work. Maybe I should just run it overnight when I’m not using the internet. But man, it’s hitting like 15 Mbps! You think that’s slow? Lol.
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orbit1337Senior Member
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#4Nov 12, 2025, 04:42 PM
Sounds more like a router issue than Core itself. Check if your modem is managing connections well. Bet you wouldn’t have the same issue with torrents.
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#5Nov 14, 2025, 04:41 PM
Nope! I use qBittorrent and it never causes issues like this. Everything else works fine except Bitcoin Core consuming like it’s starving or something.
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diamond_minerFull Member
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#6Nov 14, 2025, 08:00 PM
Wonder what speed you’re actually paying for? If Core is pulling 15 Mbps, there should be a bit of room for other devices too. Have you tried a wired connection instead?
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eric23Newbie
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#7Nov 14, 2025, 11:50 PM
Man, I know right! It’s a big deal when you’re web browsing, except for Facebook/YouTube. They probably use cache servers, so we don’t notice the slowdown. Could be that your ISP lacks a good cache.
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#8Nov 15, 2025, 05:25 AM
Not sure... I think I got a better package but who knows if it’s active. No wired connection living in a rural area with only one ISP sucks.
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pr0to88Member
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#9Nov 15, 2025, 06:02 AM
I got 950, while you’re at 60? Wow. I'm downloading and pulling 200 right now. That’s like 16x your speed!
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orbit1337Senior Member
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#10Nov 15, 2025, 09:20 AM
If your devices lose connection while Core is running, that’s sketchy. Your router should be balancing traffic. Sounds like your modem might be the culprit.
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#11Nov 15, 2025, 03:17 PM
Lol, I messed with the settings and now it's downloading everything again from scratch! What a pain. It’ll be ages at my slow speed. Been there with my old laptop, didn’t cause this mess.
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0xNodeMember
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#12Nov 15, 2025, 06:15 PM
Sounds like something has changed on your end. Speed tests can be misleading too, might not reflect your real-world usage. Could be modem troubles as others said.
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0xChadNewbie
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#13Nov 15, 2025, 07:44 PM
True, Core pulls from multiple sources, but that could choke your bandwidth. You can check peer connections, maybe limit them.
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leosatHero Member
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#14Nov 15, 2025, 11:48 PM
You mean to adjust CPU usage in Task Manager? I’m not familiar with that.
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gang2015Member
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#15Nov 16, 2025, 05:32 AM
Isn’t there a site or app for your ISP where you can check your plan? Different test results can happen based on server location. Your laptop might be the issue too.
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#16Nov 17, 2025, 01:43 AM
It should support QoS, will check when I get home. Router’s old anyway. I didn’t buy it, got it from my ISP, so I doubt it’s top-notch.
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#17Nov 17, 2025, 04:43 AM
I need my connection stable for work, so hoping for a solution. Let me know if the QoS helps.
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0xNodeMember
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#18Nov 17, 2025, 07:11 AM
There could seriously be an issue with your router handling all those connections. What type of internet do you have? DSL or cable? Each has its quirks.
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#19Nov 17, 2025, 10:59 AM
Dude, Bitcoin Core on Windows is risky business. My stuff slows down too but I've got a solid machine 16GB RAM, Intel i7... I just run it on Linux now for better performance.
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#20Nov 17, 2025, 05:09 PM
Yeah, I switched from uTorrent to qBittorrent too. Less hassle!
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