We've found that Qlikview will perform as expected with a disk response time of less than 200ms. The type of environment doesn't really matter in this case, just the disk response time. We've got plenty of customers running Qlikview on AWS and other cloud environments.
Hope this helps!
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Raul, you likely want the users to reside in the same 'region' as the Azure instance to avoid as much connection latency as possible. Other than that, it really boils down to the size of the apps and expressions etc. as to how quickly things will perform for the users. If you get the closest Azure instance to the majority of the users, that should ensure pretty good performance, the outliers may experience some performance issues, but as long as the bandwidth between their client and the Azure instance is decent, things should perform ok. Sorry I do not have anything more detailed here, shout if you have further questions, but the best thing will be to actually test your proposed setup to ensure things are going to work as you wish. You may want to take a look at the Scalability area Tool, which would allow you to run some tests to see if things look good or not.
Documents tab there should likely be the best place to start with things.
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