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  • Writer's pictureJeff Taylor

Testing Microsoft Fabric - Part 3

Sorry to disappoint you. In this post, we won't test Microsoft Fabric directly. We will compare Azure Data Factory (ADF) to Microsoft Fabric.

To quickly summarize where we are, we started testing Microsoft Fabric with a 10GB tar file, which took over 20 hours to extract, and now we have created a ticket with Microsoft.

Then we tested extracting the second level of files, 535,678 .gz files, which took 1 hour and 32 minutes.

Azure Data Factory Logo

I've been able to turn up the performance previously with Azure Data Factory, so I wanted to compare the same process we are testing in Microsoft Fabric but in Azure Data Factory.

I created a new integrated runtime and turned that up and the copy activity. I selected a custom Compute, Memory optimized, 256 cores (+ 16 Driver cores) for the runtime, and for the Copy Activity Settings, I selected 32 Maximum data integration units and 32 Degrees of copy parallelism.

Here are some screenshots of the settings:

Copy Activity Source:

Copy Activity Source

Copy Activity Sink:

Copy Activity Sink

Copy Activity Settings:

Copy Activity Settings

Linked Service:

Linked Service

Integrated runtime:

Integration Runtime Memory Optimized

First, I tested using Memory optimized, and the results were 15 hours, 49 minutes, and 46 seconds.

Memory Optimized First Test Results

Just for comparison's sake, I tested using 'General purpose', and the results were 17 hours, 58 minutes, and 14 seconds. That is 2 hours and 15 minutes slower than 'Memory Optimized'.

General Purpose First Test Results

Second Layer Files

Now, to extract the second layer of files, I am using 'Memory Optimized'. Here are the screens for this configuration. I've maximized the data integration units and parallel copies.


Second Layer Source


Second Layer Sink


Secon Layer Settings


2 hours, 7 minutes and 24 seconds.

Second Layer Test Results

Testing Summary

Overall Testing Summary

Memory Optimised at the max on ADF is faster for the first 10GB file by almost 5 hours, and Microsoft Fabric barely edges out the second extract by about 35 minutes. My laptop is still in a commanding lead at 38 minutes for the first 10GB file.

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