Why is EA testing on Live Account vs Demo account very slow in the tester compared to demo account

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Oanda Live, and Oanda Demo platforms. 

I used the tester on both and Live "visible charts" I see the chart moving slow even with the slider all the way full speed. 

On Demo it's as expected and very fast as I am use to. 

Is there some difference for Live vs Demo testing in the strategy tester ?  regarding performance and speed of the tester. 

Please advise
Thanks

The Fundamentals of Testing in MetaTrader 5
The Fundamentals of Testing in MetaTrader 5
  • www.mql5.com
What are the differences between the three modes of testing in MetaTrader 5, and what should be particularly looked for? How does the testing of an EA, trading simultaneously on multiple instruments, take place? When and how are the indicator values calculated during testing, and how are the events handled? How to synchronize the bars from different instruments during testing in an "open prices only" mode? This article aims to provide answers to these and many other questions.
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