What are FX specific issues from FIX and FAST perspective?

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Imported from previous forum

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I have a pretty decent understanding of general FIX use cases for order flow and FAST market data(I have experience in futures,options on futures,equity options and some FI).

I am trying to understand if there are any specific architectural challenges in the FX space, especially for high frequency trading.

The kinds of things I am wondering about, for example:

  1. Are market data rates significantly higher than other asset classes?
  2. Are message sizes for both order flow and market data much bigger/smaller?
  3. Is the number of FIX or FAST connections to various trading venues for a typical HFT operation much higher than those who trade non-FX?

This is one of those questions where I don’t know what I don’t know, so please feel free to elaborate on other poignant differences for FX from HFT architecture point of view.

Thanks!