SSRS reports running slow while fetching data from SQL server DB

We are currently facing issues with lots of our SSRS reports running very slow. Approx they are taking around 15-20 minutes compared to earlier which was 2-3 minutes.
Also, the SSRS reports which fetch their data from a Database is acting as Subscriber for a reporting server. That is we have an OLTP DB server whose Database say 'A' is getting replicated onto the server where say Database 'B'. On this B we have our SSRS
reports fetching the required data and are reported to be running very slow.
As a start I have checked for Index and stats to be properly updated and yes they are.
I am not sure now, from where to start analysing the issue.
I believe replication, not to be the issue as earlier also we had replication set up and never saw the slowness.
IS memory or IO causing a problem, please help as i am not sure on how to find a fix for this?
Thanks in advance!

Hi,
You need to first find out what all are slow? Is it that the whole instance is slow? How about other queries /replication etc against those databases? Are they slow?
Check the reports which are slow, try to find the slowest reports and then start looking at execution plans. Check if there is any kind of blocking happening during the time the reports run. Also try running the reports manually and see if there is a difference
in execution time. Take a look at the waitstats during the time the reports are running.
Read this to get more better understanding -
https://technet.microsoft.com/en-us/library/ms177500%28v=sql.105%29.aspx?f=255&MSPPError=-2147217396
Regards, Ashwin Menon My Blog - http:\\sqllearnings.com

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