Long response time for a query

Long response time for a query

Hi, 
Last year, I posted a question on the old forums and the answer was: you need to install the latest version...
Which we did in September (version 9.16.1434). Now we're back in that period where our application is used a lot and we're still experiencing the problem mentioned in my post last year.

What's more, we're not talking here about a problem due to the quantity of data, as the .NET method in question contains three LINQ queries, which return 7, 3 and 0 records respectively!

Any ideas on how to correct this problem?