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Simulating modem slows down WCF calls unrealistically

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Avrohom Yisroel
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Avrohom Yisroel asked on 14 Feb 2017, 05:13 PM

I'm developing some WCF web service calls, and want to test how the download times compare when using a modem connection.

I started Fiddler and checked the Rules -> Performance -> Simulate Modem speeds option. I can see that this works, as if I refresh a web page, it's slower. I tried downloading some files of around 3-6Mb, and again I could see the difference. Normally these would be pretty instant, with the performance option on, they took a few seconds.

I then tried to make my service calls. Without the Fiddler option, they typically take about 300-400ms to download about 1.5Mb. However, with the performance option on, the call takes about 40-60 seconds. This is way to slow to be realistic.

This is all running on my local machine, using Visual Studio 2015.

Anyone any idea why it's so slow?

No answers yet. Maybe you can help?

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