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Videos loading slowly

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Hi, videos in firefox load really slowly recently although I have a fast internet connection. I often use youtube and now it takes about 5-10 seconds before they start playing. Even if the video is loaded and I move the bar it still takes a couple of seconds. It only works quickly when I stop the video and play again without moving the bar. This has been appearing for a couple of days, it was really fast before that. It is not only a youtube problem, it appears anywhere. Previews on youtube work fine. What I have tried: Disabling hardware acceleration Running firefox in safe mode Reinstalling firefox (I also deleted everything in app data) Setting firefox not to use the integrated graphic card I also installed an extension where I can switch between HTML5 and Flash player Nothing works. Any ideas? Thank you :)

Hi, videos in firefox load really slowly recently although I have a fast internet connection. I often use youtube and now it takes about 5-10 seconds before they start playing. Even if the video is loaded and I move the bar it still takes a couple of seconds. It only works quickly when I stop the video and play again without moving the bar. This has been appearing for a couple of days, it was really fast before that. It is not only a youtube problem, it appears anywhere. Previews on youtube work fine. What I have tried: Disabling hardware acceleration Running firefox in safe mode Reinstalling firefox (I also deleted everything in app data) Setting firefox not to use the integrated graphic card I also installed an extension where I can switch between HTML5 and Flash player Nothing works. Any ideas? Thank you :)

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I've tried too, it doesn't work! I have to go to google chrome which I don't want to leave Firefox. But for me, it's not just Youtube. All websites load slow. I need help too.

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Hi again, I found out by accident that this problem was caused by our Samsung TV (but IDK how exactly). The TV is connected to the same wifi as my laptop and I used it to watch films from my laptop earlier this week. When I turned the TV on the problem with the slow videos disappeared. When I turned it off the videos were slow again. So I removed the TV from the connected devices and now youtube and other pages work fine. I also found out that the TV caused the same problem in Chrome too and now it works OK. I would like to know what exactly caused this problem, because I would like to connect my TV again in future.