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vickyd Member

Performance worse after increasing CPU Cores

We have Power BI Report server based reports that connect to SSAS Tabular Models (SQL Server 2017). 


We recently tried upgrading our VM , adding in more cores (4 to 😎 and RAM (64 to 128GB). This ended up making performance of reports/dashboards worse. When we reverted back the configuration things are fine again. 


We specifically noticed a strange scenario with the upgraded configuration. When I ran a certain MDX query as myself (I'm setup as an admin on the server) in SSMS Browser mode it ran in a 2 secs but the exact same query took >30secs when I was impersonating another user (we do have a fairly complicated row level security logic built into the models). With the older VM configuration it only took about 5-6 secs in impersonated mode.


Any reason why there is such a huge difference with the addition of cores/RAM? Any tips on how I can go about understanding this better?

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