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I currently use Firefox as my browser, and saw there was an add-on called "Firefox Throttle" that would limit my bandwidth usage for me. As I am on an overall low data cap from my ISP, I wanted to use this plugin, but found it was outdated and broken. What other way can I limit my bandwidth?

I am using Windows 7 x64

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Bandwidth, or data cap? Your ISP telling you that you can only use 30GB per month is a data cap, your connection being rated at 10Mbps is a bandwidth limit. –  Darth Android Jun 15 '11 at 0:01
    
I have a data cap. –  Simon Sheehan Jun 15 '11 at 0:10
    
Data usage monitoring is best done at the OS or network (router) level. –  Darth Android Jun 15 '11 at 0:20
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Data usage isn't really something that an application can "throttle"-- you either use the bandwidth, or you don't. Throttling usually indicates a limit on the speed; you use the same amount of data just over a larger time.

If you're running Windows, a program called NetLimiter is really useful for monitoring how much data is being consumed by the system.

You can also do it at the network level if your router supports it. the DD-WRT and other custom firmwares (pfsense, monowall, Tomato, OpenWRT) often display data usage in the router status

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I disagree with 'data usage isn't really something that an application can "throttle"' - how are audio applications otherwise programmed, where you can choose to capture data at, say, 22kHz vs. 44.1 kHz? Similarly, all one would need is a timer for IP packets - and if the application already read enough data in a time period, it can simply refuse to execute read requests for the rest of the period - ergo, throttle. I would agree that specifically Firefox doesn't have that possibility, however. –  sdaau Mar 27 '13 at 9:16
    
I wouldn't consider either of those scenarios "throttling" - Switching to a lower-bitrate audio codec or an application refusing to function are ways to reduce data usage; Throttling is where you have the same amount of data, but reduce the speed of transmission intentionally, usually with the implication that it could otherwise transmit faster. Reducing data usage is usually a way to combat how noticable the effects of throttling are. –  Darth Android Mar 28 '13 at 16:37
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