--- title: Your Ethernet cable is the reason your connection is... description: A slow wired connection is often blamed on the ISP or PC, but a damaged or miscategorized Ethernet cable can silently cap the link at 100Mbps instead of 1Gbps.... canonical: https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Your Ethernet cable is the reason your connection is slow, not your PC | daily.dev og:description: A slow wired connection is often blamed on the ISP or PC, but a damaged or miscategorized Ethernet cable can silently cap the link at 100Mbps instead of 1Gbps.... og:url: https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz og:image: https://api.daily.dev/og/posts/s6xESRlkZ.png og:image:alt: Your Ethernet cable is the reason your connection is slow, not your PC og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Your Ethernet cable is the reason your connection is slow, not your PC **[XDA Developers](https://daily.dev/sources/xda-developers)** · 5 min read · 0 upvotes · 0 comments ## Summary A slow wired connection is often blamed on the ISP or PC, but a damaged or miscategorized Ethernet cable can silently cap the link at 100Mbps instead of 1Gbps. Checking the Aggregated link speed under Windows Settings > Network & internet > Ethernet reveals whether the PC has negotiated a Gigabit link. Gigabit Ethernet (1000BASE-T) requires all four twisted pairs in the cable, while 100Mbps (100BASE-TX) only needs two, so a single damaged pair can leave a connection working but bottlenecked. Swapping the cable is the cheapest first troubleshooting step, though a faulty Ethernet port on the PC, router, or motherboard can cause the identical symptom. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why is my PC stuck at 100Mbps even though I pay for a faster internet plan and other devices get full speed? A damaged Ethernet cable is a common cause even when the connection still works, because Gigabit Ethernet (1000BASE-T) requires all four twisted pairs in the cable, while 100Mbps (100BASE-TX) only needs two. If one pair is damaged or has a bad crimp, the PC and router can still connect, just capped at 100Mbps instead of 1Gbps. A faulty Ethernet port on the PC, router, or motherboard can cause the identical symptom. _daily.dev surfaces practical networking troubleshooting like this for readers chasing down real-world bottlenecks._ ### How do I check my Ethernet link speed on Windows to see if my cable is bottlenecking my connection? Go to Settings > Network & internet > Ethernet, expand the connected network adapter, and look at Aggregated link speed (Receive/Transmit). If it shows 100Mbps instead of 1000Mbps, the cable or port connection is negotiating at the slower speed and bottlenecking the PC's internet speed regardless of what the ISP delivers. _Developers debugging local network performance can find quick checks like this on daily.dev._ ### Is a Cat5e cable good enough for Gigabit Ethernet, or do I need Cat6? Cat5e is sufficient for Gigabit Ethernet up to 100 meters, since Gigabit only needs support for 1000BASE-T which Cat5e provides. Cat6 offers more headroom for multi-gigabit speeds beyond 1Gbps, but for a standard Gigabit connection, the cable's physical condition matters more than whether it's Cat5e or Cat6. _daily.dev helps hands-on tinkerers compare hardware specs like Ethernet cable categories before buying._ ## Similar posts on daily.dev - [The Ethernet cable in your wall can negotiate at 1Gbps and still be bad](https://daily.dev/posts/the-ethernet-cable-in-your-wall-can-negotiate-at-1gbps-and-still-be-bad-ghefhxy6i) · XDA Developers · 0 upvotes · 0 comments - [Your home network is only as fast as its slowest cable, and most people have at least one bad one](https://daily.dev/posts/your-home-network-is-only-as-fast-as-its-slowest-cable-and-most-people-have-at-least-one-bad-one-1hkl1tbg8) · XDA Developers · 0 upvotes · 0 comments - [Your weirdest Ethernet issues may have nothing to do with your router, cable, or Windows](https://daily.dev/posts/your-weirdest-ethernet-issues-may-have-nothing-to-do-with-your-router-cable-or-windows-rh4mwkkwg) · XDA Developers · 0 upvotes · 0 comments - [I spent hours fixing my crippled Ethernet speed before discovering the connector was the culprit](https://daily.dev/posts/i-spent-hours-fixing-my-crippled-ethernet-speed-before-discovering-the-connector-was-the-culprit-unsmo0dpg) · XDA Developers · 1 upvotes · 0 comments --- Tags: [#windows](https://daily.dev/tags/windows), [#networking](https://daily.dev/tags/networking) [View this post on daily.dev](https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Your Ethernet cable is the reason your connection is slow, not your PC","url":"https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz"},"datePublished":"2026-08-13T16:04:57.376Z","dateModified":"2026-08-13T16:05:24.591Z","description":"A slow wired connection is often blamed on the ISP or PC, but a damaged or miscategorized Ethernet cable can silently cap the link at 100Mbps instead of 1Gbps....","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/98a60fc829d901c678866bca167cefab?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/98a60fc829d901c678866bca167cefab?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"XDA Developers","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"XDA Developers","logo":"https://media.daily.dev/image/upload/s--kCg6yyAP--/f_auto,q_auto/v1774964407/logos/xda-developers?_a=BAMAMiWQ0","url":"https://daily.dev/sources/xda-developers"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"windows,networking","timeRequired":"PT5M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"XDA Developers","item":"https://daily.dev/sources/xda-developers"},{"@type":"ListItem","position":3,"name":"Your Ethernet cable is the reason your connection is slow, not your PC"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/your-ethernet-cable-is-the-reason-your-connection-is-slow-not-your-pc-s6xesrlkz#faq","mainEntity":[{"@type":"Question","name":"Why is my PC stuck at 100Mbps even though I pay for a faster internet plan and other devices get full speed?","acceptedAnswer":{"@type":"Answer","text":"A damaged Ethernet cable is a common cause even when the connection still works, because Gigabit Ethernet (1000BASE-T) requires all four twisted pairs in the cable, while 100Mbps (100BASE-TX) only needs two. If one pair is damaged or has a bad crimp, the PC and router can still connect, just capped at 100Mbps instead of 1Gbps. A faulty Ethernet port on the PC, router, or motherboard can cause the identical symptom. daily.dev surfaces practical networking troubleshooting like this for readers chasing down real-world bottlenecks."}},{"@type":"Question","name":"How do I check my Ethernet link speed on Windows to see if my cable is bottlenecking my connection?","acceptedAnswer":{"@type":"Answer","text":"Go to Settings > Network & internet > Ethernet, expand the connected network adapter, and look at Aggregated link speed (Receive/Transmit). If it shows 100Mbps instead of 1000Mbps, the cable or port connection is negotiating at the slower speed and bottlenecking the PC's internet speed regardless of what the ISP delivers. Developers debugging local network performance can find quick checks like this on daily.dev."}},{"@type":"Question","name":"Is a Cat5e cable good enough for Gigabit Ethernet, or do I need Cat6?","acceptedAnswer":{"@type":"Answer","text":"Cat5e is sufficient for Gigabit Ethernet up to 100 meters, since Gigabit only needs support for 1000BASE-T which Cat5e provides. Cat6 offers more headroom for multi-gigabit speeds beyond 1Gbps, but for a standard Gigabit connection, the cable's physical condition matters more than whether it's Cat5e or Cat6. daily.dev helps hands-on tinkerers compare hardware specs like Ethernet cable categories before buying."}}]} ```