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Firefox is throttling speed

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Hello,

I had a 300mpbs connection for download, but was never able to get past 200mbps. But now today, on installing a 1gig connection, I still cannot get past 200mbps. The installer blamed it on my PC's network card. But I just ran the same speed test with Microsoft Edge 64-bit, and I was able to get past 600mbps. So clearly, this problem is isolated to Firefox.

I am using the latest Firefox 32-bit. I have no addons installed. I am running Firefox on Windows 7.

After typing this post, I thought the 32-bit Firefox was probably causing the issue, so I installed the Firefox 64-bit, and the speed increased by 50mbps to 250mbps.

Thank you.

All Replies (5)

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I just did a Firefox refresh and no change in the speed issue.

Helpful?

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Does anyone know?

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Sorry for the third back-to-back post, but I think I found something interesting. It seems this problem/bug has been going on with Firefox for at least the past four years. For example, look at this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1320745

I am also reading of other users experiencing limits at 200 or 250 mbps, but only in Firefox.

So, I am not sure why this still bug exists, even after four years. Disappointing to say the least. And I can confirm this speed issue is related to websites using https.

Please prioritize this bug and fix it. Thanks.

Helpful?

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See my screenshot and I'm plugged into the my modem(Arris SB8200 DOCSIS® 3.1 Gigabit Cable Modem). You will need to provide details on your network setup. What modem are you using? Is there a router after the modem? Are you plugged in or on WiFi? Have you plugged directly into the modem and test the speed?

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jonzn4SUSE said

See my screenshot and I'm plugged into the my modem(Arris SB8200 DOCSIS® 3.1 Gigabit Cable Modem). You will need to provide details on your network setup. What modem are you using? Is there a router after the modem? Are you plugged in or on WiFi? Have you plugged directly into the modem and test the speed?

I can barely get past 100mbps on Google's speed test on either Firefox or Microsoft Edge. But I can get over 600 on other websites.

The PC is plugged in via ethernet, directly to the modem which is also the router. You should run a speed test at speedtest.net and post your results.

Helpful?

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